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Mergers and Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Business acquisition      
Goodwill $ 740,886 $ 717,988 $ 601,379
Minimum | Existing customer contracts      
Business acquisition      
Useful life of intangible assets 1 year    
Minimum | Trade names      
Business acquisition      
Useful life of intangible assets 3 years    
Maximum | Existing customer contracts      
Business acquisition      
Useful life of intangible assets 5 years    
Maximum | Trade names      
Business acquisition      
Useful life of intangible assets 5 years    
Weighted average | Existing customer contracts      
Business acquisition      
Useful life of intangible assets 3 years    
Coffey and INDUS      
Business acquisition      
Accounts receivable   71,515  
Other current assets   18,869  
Property and equipment   14,218  
Goodwill   108,323  
Backlog and trade name intangible assets   29,445  
Other assets   747  
Current liabilities   (78,311)  
Borrowings   (65,086)  
Other long-term liabilities   (4,885)  
Net assets acquired   $ 94,835