XML 57 R46.htm IDEA: XBRL DOCUMENT v3.7.0.1

Debt - 2014 and 2017 Senior Notes (Details) - USD ($)			6 Months Ended
	Feb. 21, 2017	Oct. 06, 2014	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Debt
Debt			$ 4,261,500,000		$ 4,125,300,000
Average effective interest rate on total debt, including effects of interest rate swaps			4.20%	4.30%
2014 Senior Notes
Debt
Debt			$ 1,600,000,000		$ 1,600,000,000
2014 Senior Notes | The 2022 Notes
Debt
Principal amount		$ 800,000,000
Interest rate (as a percent)		5.75%
2014 Senior Notes | The 2022 Notes | Level 2
Debt
Fair value of debt instrument			836,000,000
2014 Senior Notes | The 2022 Notes | Prior to October 15, 2017
Debt
Redemption price percentage		100.00%
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed		105.75%
2014 Senior Notes | The 2024 Notes
Debt
Principal amount		$ 800,000,000
Interest rate (as a percent)		5.875%
2014 Senior Notes | The 2024 Notes | Level 2
Debt
Fair value of debt instrument			$ 846,000,000
2014 Senior Notes | The 2024 Notes | Prior to July 15 2024
Debt
Redemption price percentage		100.00%
2014 Senior Notes | The 2024 Notes | On or after July 15, 2024
Debt
Redemption price percentage		100.00%
Senior Notes 2017
Debt
Principal amount	$ 1,000,000,000
Interest rate (as a percent)	5.125%		5.125%
Fair value of debt instrument			$ 997,500,000
Debt			$ 1,000,000,000
Additional interest rate	0.25%
Subsequent day period triggering additional interest rate	90 days
Senior Notes 2017 | Term loan A
Debt
Amount of debt redeemed	$ 600,000,000
Senior Notes 2017 | Term loan B
Debt
Amount of debt redeemed	127,600,000
Senior Notes 2017 | Revolving credit facility
Debt
Amount of debt redeemed	$ 250,000,000
Senior Notes 2017 | Prior to December 15, 2026
Debt
Redemption price percentage	100.00%
Senior Notes 2017 | Prior to March 15, 2020
Debt
Percentage of principal amount that can be redeemed	35.00%
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed	105.125%
Senior Notes 2017 | On or after December 15, 2026
Debt
Redemption price percentage	100.00%
Maximum | 2014 Senior Notes | The 2022 Notes | Prior to October 15, 2017
Debt
Percentage of principal amount that can be redeemed		35.00%
Maximum | Senior Notes 2017
Debt
Additional interest rate	1.00%

X

- Definition

Annual interest rate increase if the Company fails to meet requirements.

+ References

No definition available.

+ Details

Name:	acm_DebtInstrumentInterestRateAnnualIncrease
Namespace Prefix:	acm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the days in default of requirements which triggers additional 0.25% interest rate increase.

+ References

No definition available.

+ Details

Name:	acm_DebtInstrumentInterestRateDurationPeriod
Namespace Prefix:	acm_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage price of original principal amount of debt, excluding required premium, at which debt can be redeemed by the issuer.

+ References

No definition available.

+ Details

Name:	acm_DebtInstrumentRedemptionPricePercentageExcludingRequiredPremium
Namespace Prefix:	acm_
Data Type:	num:percentItemType
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

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 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

Reference 2: 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

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
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 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: 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

+ 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=49121117&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=49121117&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 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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
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_DebtInstrumentAxis=acm_SeniorNotes2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=acm_SeniorNotes5.75Due2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=acm_SeniorNotes5.875Due2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=acm_SeniorNotes2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=acm_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=acm_TermLoanBFacilityMember
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_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=acm_DebtInstrumentRedemptionPeriodSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: