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Share-Based Payments - Exercisable Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Compensation expense      
Recognized compensation expense $ 73,400 $ 112,200 $ 34,400
Unrecognized compensation expense $ 91,800 115,500  
Vesting period 3 years    
Excess tax benefit from share-based payment   3,642 748
URS Corporation | Acquisition And Integration Expenses      
Compensation expense      
Compensation to settle accelerated equity awards   43,900  
Accelerated equity award - Company stock   17,600  
Accelerated equity award - cash   26,300  
Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 900,000    
Weighted Average Remaining Contractual Life 5 years 7 months 24 days    
Weighted Average Exercise Price (in dollars per share) $ 30.36    
Aggregate Intrinsic Value (in millions) $ 600    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 300,000    
Weighted Average Remaining Contractual Life 10 months 10 days    
Weighted Average Exercise Price (in dollars per share) $ 26.99    
Stock Incentive Plans, additional disclosures      
Remaining contractual life of options outstanding, low end of range 9 months 4 days    
Remaining contractual life of options outstanding, high end of range 6 years 8 months 19 days    
Aggregate intrinsic value of stock options exercised $ 600 $ 2,100 4,300
Compensation expense      
Number of stock options granted during the period 0 0  
Excess tax benefit from share-based payment $ 0 $ 3,600 $ 700
Performance Earnings Program      
Compensation expense      
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.91 $ 32.32 $ 29.32
Performance period over which objectives must be met to qualify for an award grant 3 years    
Restricted Stock Units (RSUs)      
Compensation expense      
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 29.82 31.05 $ 29.60
Restricted Stock Units (RSUs) | URS Corporation      
Compensation expense      
Weighted average grant-date fair value of stock options granted (in dollars per share)   $ 30.04  
Number of stock options granted during the period   2,600,000  
Exercise Price Range From Dollars 24.45 to Dollars 27.67      
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) 24.45    
Exercise price, high end of range (in dollars per share) $ 27.67    
Exercise Price Range From Dollars 24.45 to Dollars 27.67 | Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 200,000    
Weighted Average Remaining Contractual Life 9 months 4 days    
Weighted Average Exercise Price (in dollars per share) $ 26.21    
Aggregate Intrinsic Value (in millions) $ 500    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 200,000    
Weighted Average Remaining Contractual Life 9 months 4 days    
Weighted Average Exercise Price (in dollars per share) $ 26.21    
Exercise Price Range From Dollars 28.04 to Dollars 31.62      
Information concerning outstanding and exercisable options      
Exercise price, low end of range (in dollars per share) 28.04    
Exercise price, high end of range (in dollars per share) $ 31.62    
Exercise Price Range From Dollars 28.04 to Dollars 31.62 | Employee Stock Option      
Options Outstanding      
Number outstanding as of end of period (in shares) 700,000    
Weighted Average Remaining Contractual Life 6 years 8 months 19 days    
Weighted Average Exercise Price (in dollars per share) $ 31.27    
Aggregate Intrinsic Value (in millions) $ 100    
Options Exercisable      
Number Exercisable at the end of the period (in shares) 100,000    
Weighted Average Remaining Contractual Life 1 year 18 days    
Weighted Average Exercise Price (in dollars per share) $ 28.52