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Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)
 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Sep. 30, 2013
Identifiable intangible assets with finite useful lives      
Gross Amount $ 270,200,000   $ 249,800,000
Accumulated Amortization (178,100,000)   (166,700,000)
Intangible Assets, Net 92,121,000   83,149,000
Amortization expense 11,400,000 10,800,000  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
2014 (six months remaining) 11,600,000    
2015 21,700,000    
2016 15,400,000    
2017 12,900,000    
2018 9,700,000    
Thereafter 20,800,000    
Intangible Assets, Net 92,121,000   83,149,000
Backlog
      
Identifiable intangible assets with finite useful lives      
Gross Amount 104,400,000   94,900,000
Accumulated Amortization (93,100,000)   (89,400,000)
Intangible Assets, Net 11,300,000   5,500,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years      
Intangible Assets, Net 11,300,000   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 158,000,000   147,100,000
Accumulated Amortization (77,200,000)   (69,500,000)
Intangible Assets, Net 80,800,000   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 80,800,000   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