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Accounts Receivable - Customer Finished Goods Returns Accrual (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Customer Finished Goods Returns Accrual [Abstract]          
Warranty accrual included in customer returns RGA issued $ 6,444,000   $ 6,444,000   $ 4,612,000
Warranty accrual included in customer finished goods returns accrual 5,421,000   5,421,000   $ 6,233,000
Adjustment amount results in increase in net sales 9,261,000   9,261,000    
Adjustment amount results in cost of goods sold 5,195,000   5,195,000    
Impact on operating income from a change in estimate 4,066,000   4,066,000 $ 0  
Impact on net income $ 2,551,000   $ 2,551,000    
Increase in net income per share- basic (in dollars per share) $ 0.14   $ 0.14    
Increase in net income per share- diluted (in dollars per share) $ 0.13   $ 0.13    
Change in warranty return accrual [Roll Forward]          
Balance at beginning of period $ 13,707,000 $ 10,204,000 $ 10,845,000 10,904,000  
Charged to expense/additions 22,930,000 18,463,000 73,803,000 58,276,000  
Amounts processed (24,772,000) (20,307,000) (72,783,000) (60,820,000)  
Balance at end of period $ 11,865,000 $ 8,360,000 $ 11,865,000 $ 8,360,000  
Maximum [Member]          
Customer Finished Goods Returns Accrual [Abstract]          
Stock Adjustment Returns, Percentage of Units Sold     5.00%