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Mergers and Acquisitions - Components of Acquisition and Integration Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 02, 2016
Jun. 26, 2016
Mar. 27, 2016
Oct. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Business acquisition            
Severance including change in control payments         $ 10,917  
Professional services         5,685  
Real estate-related         2,946  
Total       $ 0 19,548 $ 0
Coffey            
Business acquisition            
Total $ 2,600 $ 1,000 $ 15,900   19,500  
Coffey | Interest expense            
Business acquisition            
Pre-payment charges paid     $ 1,900   $ 1,900