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Stock-Based Compensation (Tables)
 9 Months Ended
Jan. 31, 2017
Share-based Compensation [Abstract]  
Stock-Based Compensation Expense Allocated
For the three- and nine-month periods ended January 31, 2017 and 2016, stock-based compensation expense was allocated as follows: 
 
 
Three Months Ended 
 January 31,

Nine Months Ended 
 January 31,
(in thousands)
 
2017

2016

2017

2016
Cost of sales and distribution
 
$
160

 
$
139

 
$
468

 
$
438

Selling and marketing expenses
 
253

 
254

 
755

 
784

General and administrative expenses
 
414

 
463

 
1,254

 
1,429

Stock-based compensation expense
 
$
827

 
$
856

 
$
2,477

 
$
2,651