Accounts Receivable - Net, Warranty Returns (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Mar. 31, 2016 |
|
| Warranty Returns [Abstract] | |||||
| Warranty accrual included in customer returns RGA issued | $ 7,845,000 | $ 7,845,000 | $ 4,612,000 | ||
| Warranty accrual included in customer finished goods returns accrual | 5,862,000 | 5,862,000 | $ 6,233,000 | ||
| Change in warranty return accrual [Roll Forward] | |||||
| Balance at beginning of period | 11,559,000 | $ 9,785,000 | 10,845,000 | $ 10,904,000 | |
| Charged to expense/additions | 28,179,000 | 22,442,000 | 50,873,000 | 39,813,000 | |
| Amounts processed | (26,031,000) | (22,023,000) | (48,011,000) | (40,513,000) | |
| Balance at end of period | $ 13,707,000 | $ 10,204,000 | $ 13,707,000 | $ 10,204,000 | |