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Income Taxes (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Income Taxes, additional disclosures    
Unused federal and state research and development credits which can be carried forward indefinitely $ 22.4  
California Enterprise Zone Tax Credits which can be carried forward indefinitely 6.8  
Net deferred tax asset likely to be realized and for which no additional valuation allowance has been provided 657.3  
Valuation allowance increase 212.0  
Additional valuation allowance provided for, net deferred tax asset which is likely to be realized 95.2  
Undistributed earnings from non-U.S. subsidiaries 1,341.2  
Deferred tax liability of foreign subsidiaries 88.2  
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit 107.6 $ 52.6
Unrecognized tax benefits that would be included in the effective tax rate if recognized 77.0  
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits    
Balance at the beginning of the year 47.5 53.7
Gross increase due to acquisitions 49.4  
Gross increase in prior years' tax positions 6.4 3.3
Gross decrease in prior years' tax positions (0.2) (7.6)
Decrease due to settlement with tax authorities (2.0) (2.0)
Gross increase in current periods tax positions 6.0 2.2
Decrease due to lapse of statute of limitations (4.6) (2.1)
Gross change due to foreign exchange fluctuations (7.3)  
Balance at the end of the year 95.2 47.5
Deferred tax assets:    
Compensation and benefit accruals not currently deductible 166.7 65.5
Net operating loss carry forwards 195.9 69.3
Self insurance reserves 46.8 48.8
Research and experimentation and other tax credits 43.0 34.2
Pension liability 165.6 59.4
Accrued liabilities 267.3 63.7
Other 11.4 26.2
Total deferred tax assets 896.7 367.1
Decrease in deferred tax asset 34.8  
Deferred tax liabilities:    
Unearned revenue (101.9) (122.9)
Depreciation and amortization (76.5) (59.2)
Acquired intangible assets (219.2) (14.8)
Investment in subsidiaries (239.2)  
Total deferred tax liabilities (636.8) (196.9)
Valuation allowance (239.4) (27.1)
Net deferred tax asset 20.5  
Net deferred tax assets   143.1
Accrued penalties, excluding any related income tax benefits 3.5 2.9
Accrued interest, excluding any related income tax benefits 13.9 6.2
Tax-deductible goodwill 261.2 $ 251.6
URS Corporation    
Income Taxes, additional disclosures    
Valuation allowance increase 182.0  
Deferred tax liability related to stock basis adjustment $ 145.6  
Maximum    
Deferred tax liabilities:    
Period of amortization of goodwill 15 years  
State and Local Jurisdiction    
Deferred tax liabilities:    
Net operating loss carry forwards $ 526.0  
Foreign Tax Authority    
Deferred tax liabilities:    
Net operating loss carry forwards $ 828.7