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Mergers and Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - Coffey and INDUS - USD ($)
$ in Thousands
9 Months Ended
Jul. 02, 2017
Oct. 02, 2016
Estimated fair values of the assets acquired and liabilities assumed    
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
Existing customer contracts | Minimum    
Estimated fair values of the assets acquired and liabilities assumed    
Useful life of intangible assets 1 year  
Existing customer contracts | Maximum    
Estimated fair values of the assets acquired and liabilities assumed    
Useful life of intangible assets 5 years  
Existing customer contracts | Weighted average    
Estimated fair values of the assets acquired and liabilities assumed    
Useful life of intangible assets 3 years  
Trade names | Minimum    
Estimated fair values of the assets acquired and liabilities assumed    
Useful life of intangible assets 3 years  
Trade names | Maximum    
Estimated fair values of the assets acquired and liabilities assumed    
Useful life of intangible assets 5 years