Gain on insurance settlements (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 27, 2020 |
Dec. 29, 2019 |
Dec. 30, 2018 |
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| Gain on insurance settlements [Abstract] | |||
| Gain on insurance settlements | $ 1,000 | $ 0 | $ 0 |
| X | ||||||||||
- Definition Gain on insurance settlements [Abstract] No definition available.
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| X | ||||||||||
- Definition Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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