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Business Acquisitions, Goodwill and Intangible Assets - Acquisitions (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 17, 2014
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
item
Business acquisition            
Number of acquisition | item           1
Consideration paid in cash           $ 5,500
Acquisition and integration expenses            
Total   $ 19,997 $ 50,711 $ 35,409 $ 91,749  
Gain (loss) on disposal activities   572 (1,536) $ 572 (42,589)  
Trademark / tradename | Minimum            
Business acquisition            
Useful life       3 months 18 days    
Trademark / tradename | Maximum            
Business acquisition            
Useful life       2 years    
URS            
Business acquisition            
Consideration paid in cash $ 2,300,000          
Percentage of ownership acquired 100.00%          
Consideration paid by issuing stock $ 1,600,000          
Senior notes assumed in acquisition as part of consideration net of repayments 400,000          
Repayment of acquiree term loan as part of consideration 600,000          
Repayment of acquiree line of credit as part of consideration 100,000          
Accrued expenses and other current liabilities 240,000          
Amortization of intangible assets of acquiree for the period   20,900 59,100 $ 41,800 118,100  
Fair value adjustment of joint ventures   2,500 6,500 4,500 16,300  
Fair value adjustment of noncontrolling interests   (2,100) (3,900) (4,200) (9,600)  
Fair value of margin liability 149,100          
Billings in excess of costs on uncompleted contracts   11,700   $ 11,700    
Years the majority liability will be recognized       2 years    
Revenue and related income from operations   1,600 13,200 $ 3,200 28,400  
Acquisition and integration expenses            
Severance and personnel costs   18,400 5,400 29,900 12,000  
Professional service, real estate-related, and other expenses   1,600 45,300 5,500 79,700  
Total   $ 20,000 50,700 35,400 91,700  
Severance expense       7,700 12,000  
Severance expense paid       0 11,600  
URS | Non-core            
Acquisition and integration expenses            
Gain (loss) on disposal activities         (42,600)  
Net assets related to the loss on disposal activities     $ 112,800   112,800  
Income (losses) from continuing operations of acquiree since acquisition date       $ (2,500) $ (12,600)  
URS | Customer relationships and backlog            
Business acquisition            
Acquired backlog and customer relationship assets $ 973,800          
URS | Customer relationships and backlog | Minimum            
Business acquisition            
Useful life 1 year          
URS | Customer relationships and backlog | Maximum            
Business acquisition            
Useful life 11 years          
URS | Customer relationships and backlog | Weighted Average            
Business acquisition            
Useful life 3 years