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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Remaining future minimum rental payments under operating leases [Abstract]      
2014 $ 4,525,000    
2015 4,139,000    
2016 2,173,000    
2017 2,056,000    
2018 2,108,000    
Thereafter 7,931,000    
Total minimum lease payments 22,932,000    
Total operating lease expenses 5,122,000 4,852,000 2,889,000
Commitments to Provide Marketing Allowances under Long-Term Customer Contracts [Abstract]      
Term of long-term agreements with major customer P4Y    
Breakout of allowances recorded as reduction to revenues [Abstract]      
Allowances incurred under long-term customer contracts 13,831,000 11,830,000 13,988,000
Allowances related to a single exchange of product 33,491,000 30,998,000 17,552,000
Allowances related to core inventory purchase obligations 2,615,000 3,030,000 1,455,000
Total customer allowances recorded as a reduction of revenues 49,937,000 45,858,000 32,995,000
Marketing allowances and customer Remanufactured Core purchase obligation [Abstract]      
2014 15,297,000    
2015 9,626,000    
2016 4,641,000    
2017 4,484,000    
2018 3,891,000    
Thereafter 5,741,000    
Total marketing allowances 43,680,000    
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