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Inventories (Components of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Inventory Disclosure [Abstract]    
Packaging and raw materials $ 10,770 $ 9,984
Work in process 210 369
Finished goods 108,504 105,256
Inventories 119,484 115,609
Inventory valuation reserves related to obsolete and slow-moving inventory $ 4,200 $ 6,600