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Business Acquisitions, Goodwill, and Intangible Assets (Details 4) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Identifiable intangible assets with finite useful lives    
Gross Amount $ 249,800,000 $ 242,500,000
Accumulated Amortization (166,700,000) (145,500,000)
Intangible Assets, Net 83,149,000 96,973,000
Amortization expense 21,200,000 22,500,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
2014 18,700,000  
2015 15,800,000  
2016 13,100,000  
2017 11,900,000  
2018 8,500,000  
Thereafter 15,100,000  
Intangible Assets, Net 83,149,000 96,973,000
Amortization of acquired intangible assets included within equity in earnings of joint ventures 200,000 1,000,000
Impairment of acquired intangible assets   0
Backlog
    
Identifiable intangible assets with finite useful lives    
Gross Amount 94,900,000 91,100,000
Accumulated Amortization (89,400,000) (83,800,000)
Intangible Assets, Net 5,500,000 7,300,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net 5,500,000 7,300,000
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 147,100,000 143,600,000
Accumulated Amortization (69,500,000) (54,100,000)
Intangible Assets, Net 77,600,000 89,500,000
Amortization Period 10 years  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net 77,600,000 89,500,000
Trademark / tradename
    
Identifiable intangible assets with finite useful lives    
Gross Amount 7,800,000 7,800,000
Accumulated Amortization (7,800,000) (7,600,000)
Intangible Assets, Net   200,000
Amortization Period 2 years  
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years    
Intangible Assets, Net   $ 200,000