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Business Acquisitions, Goodwill and Intangible Assets (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Identifiable intangible assets with finite useful lives      
Gross Amount $ 1,241,100 $ 280,900  
Accumulated Amortization (581,700) (190,700)  
Intangible Assets, Net 659,438 90,238  
Amortization expense 391,000 24,000 $ 21,200
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
2016 187,400    
2017 98,100    
2018 80,100    
2019 74,700    
2020 62,500    
Thereafter 156,600    
Intangible Assets, Net 659,438 90,238  
Backlog and customer relationships      
Identifiable intangible assets with finite useful lives      
Gross Amount 1,224,700 271,600  
Accumulated Amortization (565,300) (182,800)  
Intangible Assets, Net 659,400 88,800  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
Intangible Assets, Net $ 659,400 88,800  
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 9,300  
Accumulated Amortization $ (16,400) (7,900)  
Intangible Assets, Net   1,400  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
Intangible Assets, Net   $ 1,400  
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