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Revenues (Narrrative) (Details)
6 Months Ended
Sep. 29, 2018
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