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Revenues (Narrrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 29, 2018
Mar. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenue $ 17,274 $ 17,182
Deferred revenue, current 12,100 11,900
Deferred revenue, noncurrent $ 5,200 $ 5,300
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