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Inventories (Tables)
 9 Months Ended
Jan. 31, 2019
Inventories [Abstract]  
Inventories
Inventories were as follows:

  
January 31, 2019
  
April 30, 2018
 
Finished goods
 
$
31,777
  
$
36,503
 
Work-in-process
  
2,384
   
2,139
 
Paper and other materials
  
611
   
550
 
  
$
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