XML 21 R42.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Debt (Details) (USD $) | 6 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Oct. 17, 2014 | Oct. 24, 2014 | Sep. 30, 2014 | Oct. 06, 2014
Debt |  |  |  |  |  |
Total debt | $ 4,867,900,000 us-gaap_DebtAndCapitalLeaseObligations |  |  |  | $ 1,004,000,000 us-gaap_DebtAndCapitalLeaseObligations |
Less: Current portion of debt and short-term borrowings | (176,300,000)us-gaap_DebtCurrent |  |  |  | (64,400,000)us-gaap_DebtCurrent |
Long-term debt, less current portion | 4,691,571,000 us-gaap_LongTermDebtAndCapitalLeaseObligations |  |  |  | 939,565,000 us-gaap_LongTermDebtAndCapitalLeaseObligations |
Scheduled maturities of debt: |  |  |  |  |  |
2015 (six months remaining) | 98,700,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear |  |  |  |  |
2016 | 155,800,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |  |
2017 | 329,400,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  |  |
2018 | 124,000,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |  |
2019 | 86,900,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  |  |
Thereafter | 4,073,100,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |  |
Total debt | 4,867,900,000 us-gaap_DebtAndCapitalLeaseObligations |  |  |  | 1,004,000,000 us-gaap_DebtAndCapitalLeaseObligations |
Debt agreements |  |  |  |  |  |
Repayment of indebtedness | 3,075,118,000 us-gaap_RepaymentsOfDebt | 1,113,937,000 us-gaap_RepaymentsOfDebt |  |  |  |
Prepayment Penalty On Unsecured Senior Notes | 55,639,000 acm_PrepaymentPenaltyOnUnsecuredSeniorNotes |  |  |  |  |
Debt | 4,867,900,000 us-gaap_DebtAndCapitalLeaseObligations |  |  |  | 1,004,000,000 us-gaap_DebtAndCapitalLeaseObligations |
Actual net worth of the entity | 3,429,567,000 us-gaap_StockholdersEquity |  |  |  | 2,186,517,000 us-gaap_StockholdersEquity |
Average effective interest rate on total borrowings, including the effects of swaps (as a percent) | 4.10%acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap | 2.80%acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap |  |  |  |
Line of Credit |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Consolidated leverage ratio | 4.4 acm_ConsolidatedLeverageRatio / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |
Outstanding letters of credit | 98,300,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  | 12,100,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |
Remaining borrowing capacity under the credit facility | 951,700,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  | 1,037,900,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |
Maximum increase in borrowing capacity |  |  | 500,000,000 acm_LineOfCreditFacilityMaximumIncreaseInBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |
Secured Debt |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt | 2,655,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt | 2,655,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Debt agreements |  |  |  |  |  |
Debt | 2,655,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Borrowing capacity |  |  | 1,050,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Letter of Credit |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Borrowing capacity |  |  | 500,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |  |  |
URS Corporation |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Senior notes assumed in acquisition as part of consideration |  |  | 1,000,000,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  |  |
Notes Payable to Banks |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt |  |  |  |  | 712,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt |  |  |  |  | 712,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember |
Debt agreements |  |  |  |  |  |
Debt |  |  |  |  | 712,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember |
Senior Notes |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt |  |  |  |  | 263,900,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt |  |  |  |  | 263,900,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |
Debt agreements |  |  |  |  |  |
Debt |  |  |  |  | 263,900,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |
Fair value of debt instrument | 1,674,000,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Senior Notes | URS Corporation |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt | 430,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  | 1,000,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt | 430,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  | 1,000,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Debt agreements |  |  |  |  |  |
Debt | 430,200,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  | 1,000,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Redemption price percentage |  |  | 101.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 101.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Amount of notes purchased |  |  | 600,000,000 us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 572,300,000 us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |
Fair value of long term debt | 414,500,000 us-gaap_LongTermDebtFairValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Senior Notes 5.00 Percent Due 2022 | URS Corporation |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.00PercentDue2022Member |  |
Senior Notes 3.85 Percent Due 2017 | URS Corporation |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = acm_SeniorNotes3.85PercentDue2017Member |  |
Senior Notes 5.43 Percent Series A Due July 2020 |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.43%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.43PercentSeriesADueJuly2020Member |  |  |
Senior Discount Notes 1.00 Percent Series B Due July 2022 |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorDiscountNotes1.00PercentSeriesBDueJuly2022Member |  |  |
Other Debt |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt | 182,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |  |  |  | 27,600,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt | 182,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |  |  |  | 27,600,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |
Debt agreements |  |  |  |  |  |
Debt | 182,500,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |  |  |  | 27,600,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |
Outstanding letters of credit | 341,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |  |  |  | 301,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember |
Unsecured Credit Facilities |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Remaining borrowing capacity under the credit facility | 428,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_UnsecuredCreditFacilitiesMember |  |  |  |  |
Term Loan A |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Borrowing capacity |  |  | 1,925,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_TermLoanMember |  |  |
Term Loan B |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Borrowing capacity |  |  | 760,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_TermLoanBMember |  |  |
Notes |  |  |  |  |  |
Debt |  |  |  |  |  |
Total debt | 1,600,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member |  |  |  |  |
Scheduled maturities of debt: |  |  |  |  |  |
Total debt | 1,600,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member |  |  |  |  |
Debt agreements |  |  |  |  |  |
Debt | 1,600,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member |  |  |  |  |
The 2022 Notes |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Principal amount |  |  |  |  |  | 800,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022Member
Interest rate (as a percent) |  |  |  |  |  | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022Member
The 2024 Notes |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 800,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.875Due2024Member
Interest rate (as a percent) |  |  |  |  |  | 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.875Due2024Member

X
- Definition Represents the consolidated leverage ratio. + References No definition available. + Details
Name: | acm_ConsolidatedLeverageRatio
Namespace Prefix: | acm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the average effective interest rate during the period, net of the impact of the interest rate swaps. + References No definition available. + Details
Name: | acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap
Namespace Prefix: | acm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum amount of increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
Name: | acm_LineOfCreditFacilityMaximumIncreaseInBorrowingCapacity
Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the prepayment penalty on unsecured senior notes. + References No definition available. + Details
Name: | acm_PrepaymentPenaltyOnUnsecuredSeniorNotes
Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
Name: | us-gaap_DebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongTermDebtByMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
Name: | us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
Name: | us-gaap_StockholdersEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=acm_UrsCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_OtherDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorDiscountNotes1.00PercentSeriesBDueJuly2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes3.85PercentDue2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes5.00PercentDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes5.43PercentSeriesADueJuly2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes5.75Due2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_SeniorNotes5.875Due2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_TermLoanBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=acm_UnsecuredCreditFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |