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Revenues (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 28, 2019
Mar. 30, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenue $ 18,578 $ 17,150
Deferred revenue, current 13,034 12,059
Deferred revenue, noncurrent $ 5,600 $ 5,100
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