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Commitments and Contingencies (Details) - USD ($)
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Remaining future minimum rental payments under operating leases [Abstract]      
2017 $ 3,448,000    
2018 1,767,000    
2019 1,587,000    
2020 1,296,000    
2021 1,329,000    
Thereafter 1,348,000    
Total minimum lease payments 10,775,000    
Total operating lease expenses $ 3,263,000 $ 3,030,000 $ 2,928,000
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 $ 29,845,000 18,358,000 16,099,000
Allowances related to a single exchange of product 47,451,000 36,112,000 30,948,000
Allowances related to core inventory purchase obligations 2,268,000 15,540,000 2,506,000
Total customer allowances recorded as a reduction of revenues 79,564,000 $ 70,010,000 $ 49,553,000
Marketing Allowances and Customer Remanufactured Core Purchase Obligation [Abstract]      
2017 48,754,000    
2018 14,311,000    
2019 2,442,000    
2020 1,345,000    
2021 1,341,000    
Total marketing allowances $ 68,193,000