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

Nine Months Ended 
 January 31,
(in thousands)
 
2018

2017

2018

2017
Cost of sales and distribution
 
$
256

 
$
160

 
$
777

 
$
468

Selling and marketing (income) expenses
 
183

 
253

 
385

 
755

General and administrative expenses
 
458

 
414

 
1,344

 
1,254

Stock-based compensation expense
 
$
897

 
$
827

 
$
2,506

 
$
2,477