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Revenue - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Disaggregation Of Revenue [Line Items]
Amount of revenue recognized	$ 74,866	$ 72,663	$ 56,162	$ 87,590	$ 101,752	$ 104,238	$ 105,630	$ 98,087	$ 291,281	$ 409,707	$ 422,638
Revenue recognized related to prior periods									200	200	$ 300
Aggregate value of remaining performance obligation on outstanding contracts	$ 4,845								4,845
Revenue recognized related to prior periods									0	0
December 30, 2019 Liability Ending Balance [Member]
Disaggregation Of Revenue [Line Items]
Amount of revenue recognized									1,100	2,200
Point in Time Sales [Member]
Disaggregation Of Revenue [Line Items]
Amount of revenue recognized									290,700	408,800
Over Time Sales [Member]
Disaggregation Of Revenue [Line Items]
Amount of revenue recognized									$ 600	$ 900

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