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Inventories (Tables)
 6 Months Ended
Oct. 31, 2018
Inventories [Abstract]  
Inventories
Inventories were as follows:

  
October 31, 2018
  
April 30, 2018
 
Finished goods
 
$
32,388
  
$
36,503
 
Work-in-process
  
2,473
   
2,139
 
Paper and other materials
  
441
   
550
 
  
$
35,302
  
$
39,192
 
Inventory value of estimated sales returns
  
4,261
   
4,626
 
LIFO reserve
  
(4,479
)
  
(4,329
)
Total inventories
 
$
35,084
  
$
39,489