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Business Combinations (Narrative) (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2011 | May 31, 2011 | Oct. 01, 2010
Additional interest purchased under agreements | 55.00% | 70.00% |
Purchase price | $ 711,400,000 |  | $ 259,500,000
General and administrative expense | 15,200,000 |  |
TechTeam [Member] |  |  |
Entity number of employees | 500 |  |
Sula Systems [Member] |  |  |
Entity number of employees | 70 |  |
Damon S Williams Associates, LLC [Member] |  |  |
Entity number of employees | 50 |  |
Consulting Engineering Services (India) Private Limited [Member] |  |  |
Entity number of employees | 2,000 |  |
Aker Solutions ASA [Member] |  |  |
Purchase price, before estimate | 675,000,000 |  |
Specified transactions added to share purchase agreement price | 234,600,000 |  |
Purchase price | 909,600,000 |  |
Acquired receivables | $ 134,200,000 |  |
Minimum useful life for intangibles, years | 1 |  |
Maximum useful life for intangibles, years | 15 |  |
Weighted average life for intangibles, years | 12.8 |  |

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