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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | 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 | 5,500,000 us-gaap_GoodwillPurchaseAccountingAdjustments | 5,000,000 us-gaap_GoodwillPurchaseAccountingAdjustments |
Foreign Exchange Impact | (72,000,000)us-gaap_GoodwillTranslationAdjustments | (10,200,000)us-gaap_GoodwillTranslationAdjustments |
Acquired | 3,801,000,000 us-gaap_GoodwillAcquiredDuringPeriod | 78,200,000 us-gaap_GoodwillAcquiredDuringPeriod |
Goodwill at the end of the period | 5,671,767,000 us-gaap_Goodwill | 1,884,800,000 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 | 5,300,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 5,000,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Foreign Exchange Impact | (35,300,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | (10,200,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Acquired | 1,745,400,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 78,200,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember |
Goodwill at the end of the period | 3,194,600,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = acm_DesignConsultingServicesMember | 1,487,100,000 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 | 200,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Foreign Exchange Impact | (8,300,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Acquired | 404,000,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_ConstructionServicesMember |  |
Goodwill at the end of the period | 672,800,000 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
Foreign Exchange Impact | (28,400,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember |  |
Acquired | 1,651,600,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = acm_ManagementSupportServicesMember |  |
Goodwill at the end of the period | $ 1,804,400,000 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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