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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Identifiable intangible assets with finite useful lives      
Gross Amount $ 1,263,500 $ 1,241,100  
Accumulated Amortization (784,100) (581,700)  
Intangible Assets, Net 479,439 659,438  
Amortization expense 202,400 391,000 $ 24,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
2017 96,300    
2018 82,100    
2019 76,700    
2020 64,800    
2021 55,100    
Thereafter 104,400    
Intangible Assets, Net 479,439 659,438  
Backlog and customer relationships      
Identifiable intangible assets with finite useful lives      
Gross Amount 1,247,100 1,224,700  
Accumulated Amortization (767,700) (565,300)  
Intangible Assets, Net 479,400 659,400  
Estimated amortization expense of intangible assets for the remainder of fiscal 2016 and for the succeeding years      
Intangible Assets, Net $ 479,400 659,400  
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