Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 347,325	$ 388,912	$ 589,898	$ 627,165
Non-United States
Disaggregation of Revenue [Line Items]
Net sales	343,114	385,222	581,611	619,263
United States
Disaggregation of Revenue [Line Items]
Net sales	$ 4,211	$ 3,690	$ 8,287	$ 7,902
Minimum
Disaggregation of Revenue [Line Items]
Product warranty, term			1 year
Maximum
Disaggregation of Revenue [Line Items]
Product warranty, term			3 years