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Stock-Based Compensation (Tables)
 3 Months Ended
Jul. 31, 2016
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Allocated
For the three-month periods ended July 31, 2016 and 2015, stock-based compensation expense was allocated as follows: 
 

Three Months Ended 
 July 31,
(in thousands)

2016

2015
Cost of sales and distribution
 
$
154

 
$
158

Selling and marketing expenses
 
257

 
280

General and administrative expenses
 
435

 
525

Stock-based compensation expense
 
$
846

 
$
963