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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Apr. 30, 2019
Inventories [Abstract]    
Finished goods $ 36,050 $ 33,736
Work-in-process 3,843 2,094
Paper and other materials 354 373
Gross inventory 40,247 36,203
Inventory value of estimated sales returns 8,585 3,739
LIFO reserve (4,021) (4,360)
Total inventories $ 44,811 $ 35,582