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Joint Ventures and Variable Interest Entities (Details) (USD $)	3 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013	Sep. 30, 2014
Financial information
Number of employees in some joint ventures	0acm_NumberOfEmployeesInCertainJointVentures
Current assets	$ 6,100,785,000us-gaap_AssetsCurrent		$ 3,434,113,000us-gaap_AssetsCurrent
TOTAL ASSETS	14,253,269,000us-gaap_Assets		6,123,377,000us-gaap_Assets
Current liabilities	4,413,077,000us-gaap_LiabilitiesCurrent		2,455,769,000us-gaap_LiabilitiesCurrent
TOTAL LIABILITIES	10,413,957,000us-gaap_Liabilities		3,850,897,000us-gaap_Liabilities
Total AECOM equity	3,550,220,000us-gaap_StockholdersEquity		2,186,517,000us-gaap_StockholdersEquity
Noncontrolling interests	289,092,000us-gaap_MinorityInterest		85,963,000us-gaap_MinorityInterest
TOTAL STOCKHOLDERS' EQUITY	3,839,312,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest		2,272,480,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	14,253,269,000us-gaap_LiabilitiesAndStockholdersEquity		6,123,377,000us-gaap_LiabilitiesAndStockholdersEquity
AECOM's investment in joint ventures	348,671,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures		142,901,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Gross Profit	164,223,000us-gaap_GrossProfit	78,198,000us-gaap_GrossProfit
Joint ventures summarized financial information
Revenue	4,186,035,000us-gaap_SalesRevenueServicesNet	1,953,875,000us-gaap_SalesRevenueServicesNet
Cost of revenue	4,021,812,000us-gaap_CostOfServices	1,875,677,000us-gaap_CostOfServices
Gross Profit	164,223,000us-gaap_GrossProfit	78,198,000us-gaap_GrossProfit
Net (loss) income	(80,330,000)us-gaap_ProfitLoss	56,541,000us-gaap_ProfitLoss
Summary of AECOM's equity in earnings of unconsolidated joint ventures:
Total	23,924,000us-gaap_IncomeLossFromEquityMethodInvestments	36,083,000us-gaap_IncomeLossFromEquityMethodInvestments
Minimum
Financial information
Number of partners required to form joint ventures	2acm_NumberOfPartnersRequiredToFormJointVentures / us-gaap_RangeAxis = us-gaap_MinimumMember
Consolidated Joint Ventures [Member]
Financial information
Current assets	623,200,000us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		314,100,000us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Non-current assets	321,800,000us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		106,200,000us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL ASSETS	945,000,000us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		420,300,000us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Current liabilities	389,300,000us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		229,100,000us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Non-current liabilities	15,200,000us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL LIABILITIES	404,500,000us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		229,100,000us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Total AECOM equity	262,100,000us-gaap_StockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		116,600,000us-gaap_StockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Noncontrolling interests	278,400,000us-gaap_MinorityInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		74,600,000us-gaap_MinorityInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL STOCKHOLDERS' EQUITY	540,500,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		191,200,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	945,000,000us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember		420,300,000us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Joint ventures summarized financial information
Revenue	545,300,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember	95,800,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Consolidated Joint Venture During Quarter Ended 03312014 [Member]
Financial information
TOTAL ASSETS		201,000,000us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member
TOTAL LIABILITIES		48,000,000us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member
Equity in earnings of unconsolidated joint ventures
Gain (loss) from equity in earnings of joint ventures due to the change in control	37,400,000acm_EquityMethodInvestmentGainLossDueToChangeInControl / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member
Gain (loss) from equity in earnings of joint ventures due to the change in control, net of tax	23,400,000acm_EquityMethodInvestmentGainLossDueToChangeInControlNetOfTax / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member
Fair value of the previously held equity interest, excluding control premium	58,000,000acm_EquityMethodInvestmentsFairValueExcludingControlPremium / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member
Unconsolidated Joint Ventures [Member]
Financial information
Current assets	1,238,700,000us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		539,600,000us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Non-current assets	527,600,000us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		273,700,000us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL ASSETS	1,766,300,000us-gaap_Assets / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		813,300,000us-gaap_Assets / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Current liabilities	773,100,000us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		397,900,000us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Non-current liabilities	123,800,000us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		91,000,000us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL LIABILITIES	896,900,000us-gaap_Liabilities / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		488,900,000us-gaap_Liabilities / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL STOCKHOLDERS' EQUITY	869,400,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		324,400,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,766,300,000us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		813,300,000us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
AECOM's investment in joint ventures	348,700,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember		142,900,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Gross Profit	53,900,000us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	10,000,000us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Joint ventures summarized financial information
Revenue	1,081,300,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	518,400,000us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Cost of revenue	1,027,400,000us-gaap_CostOfServices / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	508,400,000us-gaap_CostOfServices / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Gross Profit	53,900,000us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	10,000,000us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Net (loss) income	48,300,000us-gaap_ProfitLoss / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	9,200,000us-gaap_ProfitLoss / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Summary of AECOM's equity in earnings of unconsolidated joint ventures:
Pass through joint ventures	6,400,000acm_IncomeLossFromEquityMethodInvestmentsPassThroughJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	700,000acm_IncomeLossFromEquityMethodInvestmentsPassThroughJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Other joint ventures	17,500,000acm_IncomeLossFromEquityMethodInvestmentsOtherJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	35,400,000acm_IncomeLossFromEquityMethodInvestmentsOtherJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Total	$ 23,900,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember	$ 36,100,000us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember

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