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Accounts Receivable - Net, Customer Finished Goods Returns Accrual (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Customer Finished Goods Returns Accrual [Abstract]      
Warranty accrual included in customer returns RGA issued $ 5,303,000 $ 4,612,000  
Warranty return estimate included in customer finished goods returns accrual 8,983,000 6,233,000  
Adjustment amount results in increase in net sales 9,261,000    
Adjustment amount results in cost of goods sold 5,195,000    
Impact on operating income from a change in estimate 4,066,000    
Impact on net income $ 2,551,000    
Increase in net income per share- basic (in dollars per share) $ 0.14    
Increase in net income per share- diluted (in dollars per share) $ 0.13    
Change in warranty return accrual [Roll Forward]      
Balance at beginning of period $ 10,845,000 10,904,000 $ 8,039,000
Charged to expense 99,673,000 80,099,000 65,469,000
Amounts processed (96,232,000) (80,158,000) (62,604,000)
Balance at end of period $ 14,286,000 $ 10,845,000 $ 10,904,000
Maximum [Member]      
Customer Finished Goods Returns Accrual [Abstract]      
Stock Adjustment Returns, Percentage of Units Sold 5.00%