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Mergers and Acquisitions (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 19, 2016
USD ($)
Dec. 27, 2015
USD ($)
item
Dec. 28, 2014
USD ($)
Sep. 27, 2015
USD ($)
Business acquisition        
Number of acquisitions | item   0    
Contingent earn-out liability   $ 4,200    
Aggregate maximum of contingent consideration   25,600    
Increase (Decrease) in contingent consideration   1,000    
Contingent consideration liability       $ 0
Gain (loss) on change in contingent consideration   $ (1,000) $ 0  
Maximum        
Business acquisition        
Earn-out period for operating income projection   3 years    
Minimum        
Business acquisition        
Earn-out period for operating income projection   2 years    
CEG        
Business acquisition        
Aggregate fair value of purchase prices       15,900
Cash paid to the sellers       11,800
Contingent earn-out liability       4,100
Aggregate maximum of contingent consideration       $ 9,800
Coffey | BIA | Subsequent Event        
Business acquisition        
Aggregate fair value of purchase prices $ 76,000      
Ownership interest acquired 100.00%