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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 27, 2020	Mar. 31, 2019
Deferred tax assets, valuation allowance				$ 13,600
Income tax expense (benefit)	$ 53	$ (3,709)
COVID 19 [Member]
Tax refund from net operating loss carry back			$ 6,700
Income tax expense (benefit)		$ 3,700

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Tax refund from net operating loss carry back and a refund of prior AMT credits.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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