Revenue Recognition and Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended								5 Months Ended	12 Months Ended
	Dec. 31, 2017	Jan. 02, 2021	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Disaggregation Of Revenue [Line Items]
Net decrease in accumulated deficit		$ 485,134				$ 431,548				$ 385,544	$ 485,134	$ 431,548	$ 385,544
Net sales		221,601	$ 238,033	$ 202,783	$ 220,204	174,826	$ 197,823	$ 198,570	$ 173,737		882,621	744,956	698,493
Contract liabilities		22,800				7,900					$ 22,800	7,900
Revenue recognition, practical expedient											true
Accrued Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities		18,100				7,400					$ 18,100	7,400
Contract Assets, Net [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities		$ 4,600				$ 500					4,600	500
Western Segment [Member]
Disaggregation Of Revenue [Line Items]
Net sales											130,189	138,325	$ 49,701
Western Segment [Member] | Volume Products [Member] | Passes at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales										$ 23,500	$ 53,200	$ 53,900
Cumulative Effect, Period of Adoption, Adjustment [Member]
Disaggregation Of Revenue [Line Items]
Net decrease in accumulated deficit														$ 1,883
Accounting Standards Update 2014-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Disaggregation Of Revenue [Line Items]
Net decrease in accumulated deficit	$ (1,900)
Net sales	$ 8,704