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Joint Ventures and Variable Interest Entities (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 item | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 item | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Number of employees in some joint ventures | 0 |  |  |  |  |  |  |  | 0 |  |  |
Current assets | $ 3,131,602,000 |  |  |  | $ 3,147,293,000 |  |  |  | $ 3,131,602,000 | $ 3,147,293,000 |  |
TOTAL ASSETS | 5,665,623,000 |  |  |  | 5,664,568,000 |  |  |  | 5,665,623,000 | 5,664,568,000 | 5,789,300,000 |
Current liabilities | 2,053,549,000 |  |  |  | 2,078,402,000 |  |  |  | 2,053,549,000 | 2,078,402,000 |  |
TOTAL LIABILITIES | 3,591,529,000 |  |  |  | 3,440,080,000 |  |  |  | 3,591,529,000 | 3,440,080,000 |  |
Total AECOM equity | 2,021,443,000 |  |  |  | 2,169,464,000 |  |  |  | 2,021,443,000 | 2,169,464,000 |  |
Noncontrolling interests | 52,651,000 |  |  |  | 55,024,000 |  |  |  | 52,651,000 | 55,024,000 |  |
TOTAL STOCKHOLDERS' EQUITY | 2,074,094,000 |  |  |  | 2,224,488,000 |  |  |  | 2,074,094,000 | 2,224,488,000 | 2,395,137,000 | 2,138,469,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 5,665,623,000 |  |  |  | 5,664,568,000 |  |  |  | 5,665,623,000 | 5,664,568,000 |  |
AECOM's investment in joint ventures | 80,045,000 |  |  |  | 91,049,000 |  |  |  | 80,045,000 | 91,049,000 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 2,079,100,000 | 2,067,500,000 | 1,989,600,000 | 2,017,300,000 | 2,082,900,000 | 2,095,200,000 | 2,010,900,000 | 2,029,200,000 | 8,153,495,000 | 8,218,180,000 | 8,037,374,000 |
Total operating income | 122,700,000 | 111,900,000 | 80,500,000 | 61,900,000 | (199,100,000) | 102,800,000 | 73,200,000 | 76,700,000 | 376,989,000 | 53,606,000 | 421,223,000 |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Total | 6,400,000 | 4,100,000 | 7,900,000 | 5,900,000 | 10,400,000 | 12,300,000 | 16,900,000 | 9,000,000 | 24,319,000 | 48,650,000 | 44,819,000 |
Greater than or equal to |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Number of partners required to form joint ventures | 2 |  |  |  |  |  |  |  | 2 |  |  |
Consolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 185,700,000 |  |  |  | 243,200,000 |  |  |  | 185,700,000 | 243,200,000 |  |
TOTAL ASSETS | 185,700,000 |  |  |  | 243,200,000 |  |  |  | 185,700,000 | 243,200,000 |  |
Current liabilities | 38,900,000 |  |  |  | 43,100,000 |  |  |  | 38,900,000 | 43,100,000 |  |
TOTAL LIABILITIES | 38,900,000 |  |  |  | 43,100,000 |  |  |  | 38,900,000 | 43,100,000 |  |
Total AECOM equity | 106,800,000 |  |  |  | 145,100,000 |  |  |  | 106,800,000 | 145,100,000 |  |
Noncontrolling interests | 40,000,000 |  |  |  | 55,000,000 |  |  |  | 40,000,000 | 55,000,000 |  |
TOTAL STOCKHOLDERS' EQUITY | 146,800,000 |  |  |  | 200,100,000 |  |  |  | 146,800,000 | 200,100,000 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 185,700,000 |  |  |  | 243,200,000 |  |  |  | 185,700,000 | 243,200,000 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 490,900,000 | 468,600,000 | 557,800,000 |
Unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 523,100,000 |  |  |  | 598,800,000 |  |  |  | 523,100,000 | 598,800,000 |  |
Non-current assets | 47,700,000 |  |  |  | 15,200,000 |  |  |  | 47,700,000 | 15,200,000 |  |
TOTAL ASSETS | 570,800,000 |  |  |  | 614,000,000 |  |  |  | 570,800,000 | 614,000,000 |  |
Current liabilities | 382,200,000 |  |  |  | 411,200,000 |  |  |  | 382,200,000 | 411,200,000 |  |
Non-current liabilities | 17,300,000 |  |  |  | 2,700,000 |  |  |  | 17,300,000 | 2,700,000 |  |
TOTAL LIABILITIES | 399,500,000 |  |  |  | 413,900,000 |  |  |  | 399,500,000 | 413,900,000 |  |
TOTAL STOCKHOLDERS' EQUITY | 171,300,000 |  |  |  | 200,100,000 |  |  |  | 171,300,000 | 200,100,000 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 570,800,000 |  |  |  | 614,000,000 |  |  |  | 570,800,000 | 614,000,000 |  |
AECOM's investment in joint ventures | 80,000,000 |  |  |  | 91,000,000 |  |  |  | 80,000,000 | 91,000,000 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,100,000,000 | 2,000,000,000 | 2,000,000,000 |
Total operating income |  |  |  |  |  |  |  |  | 70,100,000 | 127,500,000 | 121,400,000 |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Pass through joint ventures |  |  |  |  |  |  |  |  | 6,400,000 | 5,200,000 | 3,800,000 |
Other joint ventures |  |  |  |  |  |  |  |  | 17,900,000 | 43,400,000 | 41,000,000 |
Total |  |  |  |  |  |  |  |  | $ 24,300,000 | $ 48,600,000 | $ 44,800,000 |

X
- Definition Represents the entity's proportionate share for the period of the net income (loss) of its other joint ventures to which the equity method of accounting is applied. Other joint ventures are those which have their own employees and operating expenses, and to which the entity generally makes a capital contribution. + References No definition available. + Details
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