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Business Acquisitions, Goodwill and Intangible Assets (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
2015 $ 26,500  
2016 17,500  
2017 13,200  
2018 9,900  
2019 9,000  
Thereafter 14,100  
Intangible Assets, Net 90,238 $ 83,149
Gross Amount 280,900 249,800
Accumulated Amortization (190,700) (166,700)
Intangible Assets, Net 90,238 83,149
Amortization expense 24,000 21,200
Contractual Rights [Member]    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net 12,600 5,500
Gross Amount 110,000 94,900
Accumulated Amortization (97,400) (89,400)
Intangible Assets, Net $ 12,600 5,500
Contractual Rights [Member] | Minimum    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Amortization Period 1 year  
Contractual Rights [Member] | Maximum    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Amortization Period 5 years  
Backlog and customer relationship    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net $ 76,200 77,600
Gross Amount 161,600 147,100
Accumulated Amortization (85,400) (69,500)
Intangible Assets, Net $ 76,200 77,600
Amortization Period 10 years  
Trademark / tradename    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net $ 1,400  
Gross Amount 9,300 7,800
Accumulated Amortization (7,900) $ (7,800)
Intangible Assets, Net $ 1,400  
Amortization Period 2 years