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Accounts Receivable - Net, Warranty Returns (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Warranty Returns [Abstract]          
Warranty accrual included in customer returns RGA issued $ 4,118,000   $ 4,118,000   $ 3,746,000
Warranty accrual included in customer finished goods returns accrual 4,242,000   4,242,000   $ 7,158,000
Change in warranty return accrual [Roll Forward]          
Balance at beginning of period 10,204,000 $ 8,421,000 10,904,000 $ 8,039,000  
Charged to expense/additions 18,463,000 13,651,000 58,276,000 44,010,000  
Amounts processed (20,307,000) (15,069,000) (60,820,000) (45,046,000)  
Balance at end of period $ 8,360,000 $ 7,003,000 $ 8,360,000 $ 7,003,000