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Other Financial Information (Details) (USD $) | Mar. 31, 2015 | Sep. 30, 2014
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Accrued expenses |  |
Accrued salaries and benefits | $ 817,400,000 us-gaap_EmployeeRelatedLiabilitiesCurrent | $ 400,600,000 us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued contract costs | 777,800,000 acm_AccruedContractCostsCurrent | 446,400,000 acm_AccruedContractCostsCurrent
Other accrued expenses | 306,600,000 us-gaap_OtherAccruedLiabilitiesCurrent | 117,600,000 us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses | 1,901,819,000 us-gaap_AccruedLiabilitiesCurrent | 964,627,000 us-gaap_AccruedLiabilitiesCurrent
Accrued contract costs related to professional liability accruals | $ 241,700,000 acm_AccruedContractCostsRelatedToProfessionalLiabilityCurrent | $ 120,200,000 acm_AccruedContractCostsRelatedToProfessionalLiabilityCurrent

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for obligations related to professional liability and costs for services provided by subcontractors and other non-employees. It is used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, whichever is longer). + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for obligations related to professional liability. It is used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle, whichever is longer). + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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