XML 78 R69.htm IDEA: XBRL DOCUMENT
v3.22.2

Commitments and Contingencies (Details) - USD ($) $ in Millions |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 06, 2019
Commitments and Contingencies |  |  |  |  |  |  |  |
Unsecured credit facilities |  |  |  |  | $ 438.1 |  |  |
New York |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Contingency liability |  |  |  |  | 146.0 |  |  |
Percentage of claim recoveries due to seller | 90.00% |  |  |  |  |  |  |
Percentage of claim recoveries due to purchaser | 10.00% |  |  |  |  |  |  |
Montana |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Damages sought |  |  | $ 132.0 | $ 79.0 |  |  |  |
Damages sought, counter party |  | $ 93.0 |  |  |  |  |  |
Department of Energy | New York | Minimum |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Contingency liability |  |  |  |  | 106.0 |  |  |
Department of Energy | New York | Maximum |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Contingency liability |  |  |  |  | 146.0 |  |  |
Fund investment capital commitments |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Commitment |  |  |  |  | $ 15.3 |  |  |
Commitment period |  |  |  |  | 7 years |  |  |
Standby letters of credit |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Outstanding standby letters of credit |  |  |  |  | $ 640.9 |  | $ 478.5 |
Contingency liability |  |  |  |  | 645.4 |  |  |
Surety Bond |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Contingency liability |  |  |  |  | 3,700.0 |  |  |
Collectibility of Receivables |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Unapproved change orders |  |  |  |  |  | $ 103.0 |  |
Collectibility of Receivables | New York |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Unapproved change orders |  |  |  |  |  |  |  | $ 60.4
Collectibility of Receivables | New York | Minimum |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | 148.5 |  |  |
Collectibility of Receivables | New York | Maximum |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Damages sought |  |  |  |  | 329.4 |  |  |
Collectibility of Receivables | Montana |  |  |  |  |  |  |  |
Commitments and Contingencies |  |  |  |  |  |  |  |
Unapproved change orders |  |  |  |  | 90.0 |  |  |
Damages sought |  |  |  |  | $ 144.0 |  |  |

X
- Definition The value of the award the counter party seeks in the legal matter. + References No definition available. + Details
Name: | acm_LossContingencyDamagesSoughtValueCounterParty
Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of claim recoveries and costs due to purchaser. + References No definition available. + Details
Name: | acm_PercentageOfClaimRecoveriesAndCostsDueToPurchaser
Namespace Prefix: | acm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of claim recoveries and costs due to seller. + References No definition available. + Details
Name: | acm_PercentageOfClaimRecoveriesAndCostsDueToSeller
Namespace Prefix: | acm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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://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=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6471471&loc=d3e48698-109348 + Details
Name: | us-gaap_UnapprovedChangeOrdersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_NY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_MT
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=us-gaap_GovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_CollectibilityOfReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |