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

2017
Cost of sales and distribution
 
$
159

 
$
244

Selling and marketing (income) expenses
 
168

 
246

General and administrative expenses
 
459

 
455

Stock-based compensation expense
 
$
786

 
$
945