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Stock-Based Compensation (Tables)
 6 Months Ended
Oct. 31, 2018
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Allocated
For the three- and six-month periods ended October 31, 2018 and 2017, stock-based compensation expense was allocated as follows: 
 
 
Three Months Ended 
 October 31,

Six Months Ended 
 October 31,
(in thousands)
 
2018

2017

2018

2017
Cost of sales and distribution
 
$
185

 
$
277

 
$
344

 
$
521

Selling and marketing (income) expenses
 
217

 
(44
)
 
385

 
202

General and administrative expenses
 
434

 
431

 
893

 
886

Stock-based compensation expense
 
$
836

 
$
664

 
$
1,622

 
$
1,609