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Commitments and Contingencies (Details)
 12 Months Ended
Mar. 31, 2018
USD ($)
ft²
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Remaining future minimum rental payments under operating leases [Abstract]      
2019 $ 5,873,000    
2020 4,437,000    
2021 4,501,000    
2022 4,360,000    
2023 3,066,000    
Thereafter 30,824,000    
Total minimum lease payments 53,061,000    
Total operating lease expenses $ 4,362,000 $ 3,495,000 $ 3,263,000
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 $ 24,829,000 23,684,000 29,845,000
Allowances related to a single exchange of product 79,813,000 67,262,000 47,451,000
Allowances related to core inventory purchase obligations 2,545,000 5,470,000 2,268,000
Total customer allowances recorded as a reduction of revenues 107,187,000 $ 96,416,000 $ 79,564,000
Marketing Allowances and Customer Remanufactured Core Purchase Obligation [Abstract]      
2019 30,154,000    
2020 21,927,000    
2021 16,982,000    
2022 113,000    
Total marketing allowances $ 69,176,000    
New Distribution Center in Mexico [Member]      
Operating Lease Commitments [Abstract]      
Operating lease term 15 years    
Area of distribution center in Tijuana, Mexico | ft² 410,000