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Inventories
9 Months Ended
Jan. 31, 2018
Inventories [Abstract]  
Inventories
9.
Inventories
 
Inventories were as follows:
 
  
January 31,
  
April 30,
 
  
2018
  
2017
 
Finished goods
 
$
35,822
  
$
38,329
 
Work-in-process
  
3,292
   
7,078
 
Paper and other materials
  
626
   
650
 
  
$
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