Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Assets at Fair Value on a Recurring Basis (Details)

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Fair Value Measurements - Summary of Assets at Fair Value on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Oct. 01, 2017
Dec. 25, 2016
Assets:    
Investments in rabbi trust $ 8,936 $ 9,165
Total assets measured at fair value 8,936 9,165
Level 1    
Assets:    
Investments in rabbi trust 8,936 9,165
Total assets measured at fair value 8,936 9,165
Level 2    
Assets:    
Investments in rabbi trust 0 0
Total assets measured at fair value 0 0
Level 3    
Assets:    
Investments in rabbi trust 0 0
Total assets measured at fair value $ 0 $ 0