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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