Revenues (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 26, 2020	Mar. 28, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Deferred revenue	$ 16,920	$ 18,506
Deferred revenue, current	12,139	13,129
Deferred revenue, noncurrent	$ 4,800	$ 5,400
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Payment term	15 days
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Payment term	45 days
Tire Road Hazard Warranty [Member] | Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognition, contract term	21 months
Tire Road Hazard Warranty [Member] | Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue recognition, contract term	36 months