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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Remaining future minimum rental payments under operating leases [Abstract]      
2015 $ 2,953,000    
2016 1,288,000    
2017 1,081,000    
2018 1,066,000    
2019 1,031,000    
Thereafter 3,209,000    
Total minimum lease payments 10,628,000    
Total operating lease expenses 2,928,000 2,567,000 2,825,000
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 16,099,000 13,590,000 11,549,000
Allowances related to a single exchange of product 30,948,000 27,392,000 19,544,000
Allowances related to core inventory purchase obligations 2,506,000 2,615,000 3,030,000
Total customer allowances recorded as a reduction of revenues 49,553,000 43,597,000 34,123,000
Marketing allowances and customer Remanufactured Core purchase obligation [Abstract]      
2015 15,460,000    
2016 11,420,000    
2017 5,983,000    
2018 5,390,000    
2019 4,192,000    
Thereafter 4,551,000    
Total marketing allowances 46,996,000    
Workers Compensation Insurance [Abstract]      
Period over which Company purchased workers compensation insurance on large deductible plan 5 years    
Amount of each workers compensation claim for which Company is liable $ 250,000