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Inventories (Details) - USD ($)
$ in Thousands
Jan. 31, 2019
Apr. 30, 2018
Inventories [Abstract]    
Finished goods $ 31,777 $ 36,503
Work-in-process 2,384 2,139
Paper and other materials 611 550
Gross inventory 34,772 39,192
Inventory value of estimated sales returns 5,046 4,626
LIFO reserve (4,554) (4,329)
Total inventories $ 35,264 $ 39,489