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Inventories (Components of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Inventory Disclosure [Abstract]      
Packaging and raw materials $ 13,704   $ 13,112
Work in process 237   157
Finished goods 99,628   105,278
Inventories 113,569 $ 116,779 118,547
Inventory valuation reserves related to obsolete and slow-moving inventory $ 3,300   $ 4,200