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Business Acquisitions, Goodwill and Intangible Assets (Details 3) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2015
Mar. 31, 2016
Mar. 31, 2015
Identifiable intangible assets with finite useful lives      
Gross Amount $ 1,241,100 $ 1,243,000  
Accumulated Amortization (581,700) (710,300)  
Intangible Assets, Net 659,438 532,700  
Amortization expense   128,600 $ 208,100
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
2016 (nine months remaining)   67,500  
2017   94,300  
2018   79,900  
2019   74,500  
2020   62,100  
Thereafter   154,400  
Intangible Assets, Net 659,438 532,700  
Backlog and customer relationships      
Identifiable intangible assets with finite useful lives      
Gross Amount 1,224,700 1,226,600  
Accumulated Amortization (565,300) (693,900)  
Intangible Assets, Net 659,400 532,700  
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
Intangible Assets, Net $ 659,400 532,700  
Backlog and customer relationships | Minimum      
Identifiable intangible assets with finite useful lives      
Amortization Period 1 year    
Backlog and customer relationships | Maximum      
Identifiable intangible assets with finite useful lives      
Amortization Period 11 years    
Trademark / tradename      
Identifiable intangible assets with finite useful lives      
Gross Amount $ 16,400 16,400  
Accumulated Amortization $ (16,400) $ (16,400)  
Trademark / tradename | Minimum      
Identifiable intangible assets with finite useful lives      
Amortization Period 3 months 18 days    
Trademark / tradename | Maximum      
Identifiable intangible assets with finite useful lives      
Amortization Period 2 years