Basis of Presentation and Business - Additional information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2020 USD ($) Center	Jun. 27, 2020 USD ($)	Sep. 26, 2020 USD ($) Facility Center	Mar. 29, 2020 USD ($)	Mar. 28, 2020 USD ($)
Organization And Business Operations [Line Items]
Decreased in retained earnings	$ (29,121)		$ (29,121)		$ 48
Trade accounts receivable, net	46,826		46,826		45,733
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Organization And Business Operations [Line Items]
Increase in allowance for credit losses				$ 200
Decreased in retained earnings				$ 200
Trade accounts receivable, net	300		300		400
Other notes receivable net of reserves	400		400		$ 500
COVID-19
Organization And Business Operations [Line Items]
CARES act subsidies recognized		$ 600
Deferred payroll taxes paid			7,400
CEWS payroll subsidies recognized	$ 2,600		6,200
CEWS subsidies received			$ 5,600
U.S [Member]
Organization And Business Operations [Line Items]
Number of manufacturing facilities | Facility			33
Number of sales centers | Center	18		18
Canada [Member]
Organization And Business Operations [Line Items]
Number of manufacturing facilities | Facility			5