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Accounts Receivable - Net, Customer Finished Goods Returns Accrual (Details) - USD ($) | 12 Months Ended
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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% |  |

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- Definition Amount as of the balance sheet date of the warranty estimate for which an RGA has not been issued and is included in the customer finished goods returns accrual liability. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the warranty accrual for which an RGA has been issued and is included as an offset account to total net accounts receivable. + References No definition available. + Details
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