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Accounts Receivable-Net (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Sep. 30, 2014
Accounts Receivable-Net |  |
Billed | $ 2,365,600,000 acm_BilledReceivablesCurrent | $ 1,248,400,000 acm_BilledReceivablesCurrent
Unbilled | 2,093,300,000 us-gaap_UnbilledReceivablesCurrent | 1,214,800,000 us-gaap_UnbilledReceivablesCurrent
Contract retentions | 403,000,000 us-gaap_ContractReceivableRetainageDueOneYearOrLess | 263,900,000 us-gaap_ContractReceivableRetainageDueOneYearOrLess
Total accounts receivable-gross | 4,861,900,000 us-gaap_AccountsReceivableGrossCurrent | 2,727,100,000 us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts | (76,600,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (72,100,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total accounts receivable -net | 4,785,335,000 us-gaap_ReceivablesNetCurrent | 2,654,976,000 us-gaap_ReceivablesNetCurrent
Period in which unbilled receivables are expected to be billed and collected | 12 months |
Total receivables sold that remain outstanding | $ 181,200,000 acm_ReceivablesSoldThatRemainOutstanding | $ 111,900,000 acm_ReceivablesSoldThatRemainOutstanding

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- Definition Billed contract receivables for services rendered or products shipped. + References No definition available. + Details
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- Definition The amount of receivables sold to financial institutions that remain outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the period in which unbilled receivables are expected to be billed and collected in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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 210.5-02.3) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 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 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected in the next 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49370-109356 + Details
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- Details
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- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -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 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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