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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2013
Changes in the carrying value of goodwill by reporting segment |  |  |
Goodwill at the beginning of the period | $ 1,937,338,000 us-gaap_Goodwill | $ 1,811,800,000 us-gaap_Goodwill |
Post-Acquisition Adjustments | 3,846,900,000 us-gaap_GoodwillPurchaseAccountingAdjustments | 79,100,000 us-gaap_GoodwillPurchaseAccountingAdjustments |
Foreign Exchange Impact | 9,700,000 us-gaap_GoodwillTranslationAdjustments | 5,000,000 us-gaap_GoodwillTranslationAdjustments |
Acquired | (128,500,000)us-gaap_GoodwillAcquiredDuringPeriod | (8,500,000)us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill at the end of the period | 5,665,369,000 us-gaap_Goodwill | 1,887,400,000 us-gaap_Goodwill |
Design and Consulting Services |  |  |
Changes in the carrying value of goodwill by reporting segment |  |  |
Goodwill at the beginning of the period | 1,479,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 1,414,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Post-Acquisition Adjustments | 1,768,200,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 79,100,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Foreign Exchange Impact | 5,500,000 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 5,000,000 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Acquired | (60,400,000)us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | (8,500,000)us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Goodwill at the end of the period | 3,192,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 1,489,700,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Construction Services |  |  |
Changes in the carrying value of goodwill by reporting segment |  |  |
Goodwill at the beginning of the period | 276,900,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  | 216,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember
Post-Acquisition Adjustments | 370,200,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Foreign Exchange Impact | 4,200,000 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Acquired | (24,100,000)us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Goodwill at the end of the period | 627,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember | 216,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember | 216,500,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember
Management Services |  |  |
Changes in the carrying value of goodwill by reporting segment |  |  |
Goodwill at the beginning of the period | 181,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember |  | 181,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember
Post-Acquisition Adjustments | 1,708,500,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember |  |
Acquired | (44,000,000)us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember |  |
Goodwill at the end of the period | $ 1,845,700,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember | $ 181,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember | $ 181,200,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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