| Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | 
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 35,619 | $ 32,892 | 
| Work in process | 6,120 | 5,696 | 
| Finished goods | 30,246 | 28,501 | 
| Inventories, gross | 71,985 | 67,089 | 
| Valuation reserves | (2,296) | (2,199) | 
| Inventories, net | $ 69,689 | $ 64,890 | 
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- References No definition available. 
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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of valuation reserve for inventory. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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