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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)
 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Sep. 30, 2013
Identifiable intangible assets with finite useful lives      
Gross Amount $ 270,700,000   $ 249,800,000
Accumulated Amortization (184,000,000)   (166,700,000)
Intangible Assets, Net 86,717,000   83,149,000
Amortization expense 17,300,000 16,100,000  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
2014 (three months remaining) 5,700,000    
2015 21,700,000    
2016 15,500,000    
2017 13,000,000    
2018 9,700,000    
Thereafter 21,100,000    
Intangible Assets, Net 86,717,000   83,149,000
Backlog
      
Identifiable intangible assets with finite useful lives      
Gross Amount 104,300,000   94,900,000
Accumulated Amortization (95,000,000)   (89,400,000)
Intangible Assets, Net 9,300,000   5,500,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
Intangible Assets, Net 9,300,000   5,500,000
Backlog | Minimum
      
Identifiable intangible assets with finite useful lives      
Amortization Period 1 year    
Backlog | Maximum
      
Identifiable intangible assets with finite useful lives      
Amortization Period 5 years    
Customer relationships
      
Identifiable intangible assets with finite useful lives      
Gross Amount 158,600,000   147,100,000
Accumulated Amortization (81,200,000)   (69,500,000)
Intangible Assets, Net 77,400,000   77,600,000
Amortization Period 10 years    
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
Intangible Assets, Net 77,400,000   77,600,000
Trademark / tradename
      
Identifiable intangible assets with finite useful lives      
Gross Amount 7,800,000   7,800,000
Accumulated Amortization $ (7,800,000)   $ (7,800,000)
Amortization Period 2 years