Basis of Presentation and Business - Additional information (Detail)	3 Months Ended	9 Months Ended
	Dec. 26, 2020 USD ($) Center	Dec. 26, 2020 USD ($) Facility Center	Mar. 29, 2020 USD ($)	Mar. 28, 2020 USD ($)
Organization And Business Operations [Line Items]
Decreased in retained earnings	$ (50,720,000)	$ (50,720,000)		$ 48,000
Trade accounts receivable, net	41,325,000	41,325,000		45,733,000
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			$ 200,000
Decreased in retained earnings			$ 200,000
Trade accounts receivable, net	500,000	500,000		400,000
Other notes receivable net of reserves	400,000	400,000		$ 500,000
COVID-19
Organization And Business Operations [Line Items]
CARES act and other state level programs subsidies recognized	200,000	800,000
Deferred payroll taxes paid		11,600,000
CEWS payroll subsidies recognized	$ 0	$ 6,200,000
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