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Joint Ventures and Variable Interest Entities (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 item | Mar. 31, 2014 | Mar. 31, 2015 item | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Financial information |  |  |  |  |  |
Number of employees in some joint ventures | 0 acm_NumberOfEmployeesInCertainJointVentures |  | 0 acm_NumberOfEmployeesInCertainJointVentures |  |  |
Current assets | $ 5,985,183,000 us-gaap_AssetsCurrent |  | $ 5,985,183,000 us-gaap_AssetsCurrent |  |  | $ 3,434,113,000 us-gaap_AssetsCurrent
TOTAL ASSETS | 14,016,005,000 us-gaap_Assets |  | 14,016,005,000 us-gaap_Assets |  |  | 6,123,377,000 us-gaap_Assets
Current liabilities | 4,461,104,000 us-gaap_LiabilitiesCurrent |  | 4,461,104,000 us-gaap_LiabilitiesCurrent |  |  | 2,455,769,000 us-gaap_LiabilitiesCurrent
TOTAL LIABILITIES | 10,295,160,000 us-gaap_Liabilities |  | 10,295,160,000 us-gaap_Liabilities |  |  | 3,850,897,000 us-gaap_Liabilities
Total AECOM equity | 3,429,567,000 us-gaap_StockholdersEquity |  | 3,429,567,000 us-gaap_StockholdersEquity |  |  | 2,186,517,000 us-gaap_StockholdersEquity
Noncontrolling interests | 291,278,000 us-gaap_MinorityInterest |  | 291,278,000 us-gaap_MinorityInterest |  |  | 85,963,000 us-gaap_MinorityInterest
TOTAL STOCKHOLDERS' EQUITY | 3,720,845,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 3,720,845,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  | 2,272,480,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 14,016,005,000 us-gaap_LiabilitiesAndStockholdersEquity |  | 14,016,005,000 us-gaap_LiabilitiesAndStockholdersEquity |  |  | 6,123,377,000 us-gaap_LiabilitiesAndStockholdersEquity
AECOM's investment in joint ventures | 336,221,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 336,221,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  | 142,901,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Gross Profit | 103,312,000 us-gaap_GrossProfit | 87,407,000 us-gaap_GrossProfit | 238,042,000 us-gaap_GrossProfit | 165,605,000 us-gaap_GrossProfit |  |
Joint ventures summarized financial information |  |  |  |  |  |
Revenue | 4,506,197,000 us-gaap_SalesRevenueServicesNet | 1,872,224,000 us-gaap_SalesRevenueServicesNet | 8,716,665,000 us-gaap_SalesRevenueServicesNet | 3,826,099,000 us-gaap_SalesRevenueServicesNet |  |
Cost of revenue. | 4,402,885,000 us-gaap_CostOfServices | 1,784,817,000 us-gaap_CostOfServices | 8,478,623,000 us-gaap_CostOfServices | 3,660,494,000 us-gaap_CostOfServices |  |
Gross Profit | 103,312,000 us-gaap_GrossProfit | 87,407,000 us-gaap_GrossProfit | 238,042,000 us-gaap_GrossProfit | 165,605,000 us-gaap_GrossProfit |  |
Net income (loss) | 20,604,000 us-gaap_ProfitLoss | 42,496,000 us-gaap_ProfitLoss | (97,463,000)us-gaap_ProfitLoss | 99,037,000 us-gaap_ProfitLoss |  |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |
Total | 24,628,000 us-gaap_IncomeLossFromEquityMethodInvestments | 7,436,000 us-gaap_IncomeLossFromEquityMethodInvestments | 48,552,000 us-gaap_IncomeLossFromEquityMethodInvestments | 43,519,000 us-gaap_IncomeLossFromEquityMethodInvestments |  |
Minimum |  |  |  |  |  |
Financial information |  |  |  |  |  |
Number of partners required to form joint ventures | 2 acm_NumberOfPartnersRequiredToFormJointVentures / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 2 acm_NumberOfPartnersRequiredToFormJointVentures / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Consolidated Joint Ventures |  |  |  |  |  |
Financial information |  |  |  |  |  |
Current assets | 677,900,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 677,900,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 314,100,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Non-current assets | 251,200,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 251,200,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 106,200,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL ASSETS | 929,100,000 us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 929,100,000 us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 420,300,000 us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Current liabilities | 375,700,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 375,700,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 229,100,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Non-current liabilities | 7,900,000 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 7,900,000 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  |
TOTAL LIABILITIES | 383,600,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 383,600,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 229,100,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Total AECOM equity | 264,800,000 us-gaap_StockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 264,800,000 us-gaap_StockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 116,600,000 us-gaap_StockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Noncontrolling interests | 280,700,000 us-gaap_MinorityInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 280,700,000 us-gaap_MinorityInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 74,600,000 us-gaap_MinorityInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL STOCKHOLDERS' EQUITY | 545,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 545,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 191,200,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 929,100,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  | 929,100,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |  | 420,300,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember
Joint ventures summarized financial information |  |  |  |  |  |
Revenue |  |  | 1,188,900,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember | 229,300,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_ConsolidatedJointVenturesMember |  |
Consolidated Joint Venture During Quarter Ended 03312014 |  |  |  |  |  |
Financial information |  |  |  |  |  |
TOTAL ASSETS | 201,000,000 us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |  | 201,000,000 us-gaap_Assets / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |  |  |
TOTAL LIABILITIES | 48,000,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |  | 48,000,000 us-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 |  |  |  |  | 37,400,000 acm_EquityMethodInvestmentGainLossDueToChangeInControl / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |
Gain (loss) from equity in earnings of joint ventures due to the change in control, net of tax |  |  |  |  | 23,400,000 acm_EquityMethodInvestmentGainLossDueToChangeInControlNetOfTax / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |
Fair value of the previously held equity interest, excluding control premium | 58,000,000 acm_EquityMethodInvestmentsFairValueExcludingControlPremium / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |  | 58,000,000 acm_EquityMethodInvestmentsFairValueExcludingControlPremium / dei_LegalEntityAxis = acm_ConsolidatedJointVentureDuringQuarterEnded03312014Member |  |  |
Unconsolidated Joint Ventures |  |  |  |  |  |
Financial information |  |  |  |  |  |
Current assets | 1,159,400,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 1,159,400,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 539,600,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Non-current assets | 524,000,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 524,000,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 273,700,000 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL ASSETS | 1,683,400,000 us-gaap_Assets / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 1,683,400,000 us-gaap_Assets / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 813,300,000 us-gaap_Assets / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Current liabilities | 870,800,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 870,800,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 397,900,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Non-current liabilities | 121,100,000 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 121,100,000 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 91,000,000 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL LIABILITIES | 991,900,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 991,900,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 488,900,000 us-gaap_Liabilities / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL STOCKHOLDERS' EQUITY | 691,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 691,500,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 324,400,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,683,400,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 1,683,400,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 813,300,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
AECOM's investment in joint ventures | 336,200,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  | 336,200,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |  | 142,900,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember
Gross Profit |  |  | 116,600,000 us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 34,300,000 us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Joint ventures summarized financial information |  |  |  |  |  |
Revenue |  |  | 2,175,600,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 991,700,000 us-gaap_SalesRevenueServicesNet / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Cost of revenue. |  |  | 2,059,000,000 us-gaap_CostOfServices / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 957,400,000 us-gaap_CostOfServices / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Gross Profit |  |  | 116,600,000 us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 34,300,000 us-gaap_GrossProfit / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Net income (loss) |  |  | 104,200,000 us-gaap_ProfitLoss / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 34,300,000 us-gaap_ProfitLoss / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |
Pass through joint ventures |  |  | 13,400,000 acm_IncomeLossFromEquityMethodInvestmentsPassThroughJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 3,200,000 acm_IncomeLossFromEquityMethodInvestmentsPassThroughJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Other joint ventures |  |  | 35,200,000 acm_IncomeLossFromEquityMethodInvestmentsOtherJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | 40,300,000 acm_IncomeLossFromEquityMethodInvestmentsOtherJointVentures / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |
Total |  |  | $ 48,600,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember | $ 43,500,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = acm_UnconsolidatedJointVenturesMember |  |

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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + 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 210.5-02.21) -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 02 -Paragraph 21 -Article 5 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + 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 210.5-02.31) -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 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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