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Inventories (Details) - USD ($)
$ in Thousands
Jan. 31, 2018
Apr. 30, 2017
Inventories [Abstract]    
Finished goods $ 35,822 $ 38,329
Work-in-process 3,292 7,078
Paper and other materials 626 650
Gross inventory 39,740 46,057
Inventory value of estimated sales returns 7,217 4,727
LIFO reserve (3,157) (2,932)
Total inventories $ 43,800 $ 47,852