Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Fair Value Measurements - Summary of Assets at Fair Value on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Apr. 21, 2019
Dec. 30, 2018
Assets:    
Investments in rabbi trust $ 7,092 $ 8,198
Total assets measured at fair value 7,092 8,198
Level 1    
Assets:    
Investments in rabbi trust 7,092 8,198
Total assets measured at fair value 7,092 8,198
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