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Inventory (Details) - USD ($) | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Inventory - net [Abstract] |  |
Raw materials | $ 99,360,000 | $ 95,757,000
Work in process | 3,906,000 | 3,502,000
Finished goods | 135,601,000 | 146,366,000
Inventory, gross | 238,867,000 | 245,625,000
Less allowance for excess and obsolete inventory | (13,208,000) | (11,899,000)
Total | 225,659,000 | 233,726,000
Inventory unreturned | $ 9,021,000 | $ 8,469,000

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