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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Identifiable intangible assets with finite useful lives      
Gross Amount $ 1,261,500   $ 1,263,500
Accumulated Amortization (834,700)   (784,100)
Intangible Assets, Net 426,790   479,439
Amortization expense 50,600 $ 128,600  
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years      
2017 (six months remaining) 47,600    
2018 81,900    
2019 76,600    
2020 64,700    
2021 54,900    
Thereafter 101,100    
Intangible Assets, Net 426,790   479,439
Backlog and customer relationships      
Identifiable intangible assets with finite useful lives      
Gross Amount 1,245,100   1,247,100
Accumulated Amortization (818,300)   (767,700)
Intangible Assets, Net 426,800   479,400
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years      
Intangible Assets, Net $ 426,800   479,400
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