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Inventories
6 Months Ended
Oct. 31, 2017
Inventories [Abstract]  
Inventories
9.
Inventories
Inventories were as follows (in thousands):
  
October 31,
  
April 30,
 
  
2017
  
2016
  
2017
 
Finished goods
 
$
35,217
  
$
42,063
  
$
38,329
 
Work-in-process
  
3,427
   
5,055
   
7,078
 
Paper and other materials
  
517
   
3,557
   
650
 
  
$
39,161
  
$
50,675
  
$
46,057
 
Inventory value of estimated sales returns
  
7,461
   
6,028
   
4,727
 
LIFO reserve
  
(3,082
)
  
(4,924
)
  
(2,932
)
Total inventories
 
$
43,540
  
$
51,779
  
$
47,852