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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Apr. 30, 2018
Inventories [Abstract]    
Finished goods $ 33,388 $ 36,503
Work-in-process 2,414 2,139
Paper and other materials 696 550
Gross inventory 36,498 39,192
Inventory value of estimated sales returns 4,478 4,626
LIFO reserve (4,404) (4,329)
Total inventories $ 36,572 $ 39,489