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

Nine Months Ended 
 January 31,
(in thousands)
 
2016

2015

2016

2015
Cost of sales and distribution
 
$
139

 
$
88

 
$
438

 
$
370

Selling and marketing expenses
 
254

 
216

 
784

 
689

General and administrative expenses
 
463

 
469

 
1,429

 
1,478

Stock-based compensation expense
 
$
856

 
$
773

 
$
2,651

 
$
2,537