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 | 
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- Definition Deferred Compensation Plan Assets, Fair Value Disclosure No definition available. 
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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