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Revenues (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 26, 2020
Mar. 28, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenue $ 16,291 $ 18,506
Deferred revenue, current 11,837 13,129
Deferred revenue, noncurrent $ 4,500 $ 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