XML 65 R57.htm IDEA: XBRL DOCUMENT
v3.20.1

Debt - URS Senior Notes (Details) - USD ($) $ in Millions | Oct. 24, 2014 | Mar. 31, 2020 | Sep. 30, 2019 | Apr. 03, 2017 | Feb. 21, 2017 | Sep. 29, 2016 | Oct. 17, 2014
--- | --- | --- | --- | --- | --- | --- | ---
Debt |  |  |  |  |  |  |
Debt |  | $ 2,153.1 | $ 3,352.5 |  |  |  |
Term loan A |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Amount of debt redeemed |  |  |  |  | $ 600.0 |  |
Borrowing capacity |  |  |  |  |  | $ 185.0 |
URS Senior Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt |  | 248.1 | $ 248.1 |  |  |  | $ 1,000.0
Redemption price equal to principal using proceeds from equity offerings (in percent) | 101.00% |  |  |  |  |  |
Amount of debt redeemed | $ 572.3 |  |  |  |  |  |
URS Senior Notes | 2017 URS Senior Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.85%
Amount of debt redeemed |  |  |  | $ 179.2 |  |  |
URS Senior Notes | 2022 URS Senior Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.00%
Debt |  | 248.1 |  |  |  |  |
Fair value of debt instrument |  | $ 235.5 |  |  |  |  |

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 Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 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
- 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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