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Commitments and Contingencies (Details) - USD ($)
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Change in warranty return accrual [Roll Forward]      
Balance at beginning of period $ 19,475,000 $ 16,646,000 $ 14,286,000
Acquisition [1] 0 221,000 0
Charged to expense 112,590,000 111,321,000 105,156,000
Amounts processed (113,765,000) (108,713,000) (102,796,000)
Balance at end of period $ 18,300,000 19,475,000 16,646,000
Contingencies [Abstract]      
Estimated additional import duties   17,000,000  
Commitments to Provide Marketing Allowances under Long-Term Customer Contracts [Abstract]      
Term of long-term agreements with major customer 4 years    
Breakout of allowances recorded as reduction to revenues [Abstract]      
Allowances incurred under long-term customer contracts $ 26,733,000 29,612,000 24,829,000
Allowances related to a single exchange of product 97,408,000 92,588,000 79,851,000
Amortization of core premiums paid to customers 4,501,000 4,127,000 3,588,000
Total customer allowances recorded as a reduction of revenues 128,642,000 $ 126,327,000 $ 108,268,000
Marketing Allowances, Fiscal Year Maturity [Abstract]      
2021 25,896,000    
2022 5,838,000    
2023 4,701,000    
2024 2,859,000    
2025 2,052,000    
Thereafter 2,667,000    
Total marketing allowances $ 44,013,000    
[1] Warranty reserve established in the opening balance sheet in connection with the Company's Dixie acquisition.