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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jul. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Identifiable intangible assets with finite useful lives        
Gross Amount   $ 1,270,900   $ 1,263,500
Accumulated Amortization   (860,600)   (784,100)
Intangible Assets, Net   410,294   479,439
Amortization expense   76,500 $ 169,100  
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years        
2017 (three months remaining)   24,000    
2018   83,700    
2019   78,400    
2020   66,400    
2021   56,400    
Thereafter   101,400    
Intangible Assets, Net   410,294   479,439
Acquisitions -additional disclosures        
Total consideration   4,100   5,500
Shimmick Construction Company, Inc | Subsequent Event        
Acquisitions -additional disclosures        
Total consideration $ 175,000      
Backlog and customer relationships        
Identifiable intangible assets with finite useful lives        
Gross Amount   1,254,500   1,247,100
Accumulated Amortization   (844,200)   (767,700)
Intangible Assets, Net   410,300   479,400
Estimated amortization expense of intangible assets for the remainder of fiscal 2017 and for the succeeding years        
Intangible Assets, Net   $ 410,300   479,400
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   16,400
Accumulated Amortization   $ (16,400)   $ (16,400)
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