Inventories
 9 Months Ended
Jan. 31, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following:
As of
(in thousands)
January 31, 2016
 
May 3, 2015
Raw materials
$
54,977

 
$
57,757

Work-in-process
133,324

 
146,773

Finished goods
74,290

 
79,140

Total inventories
$
262,591

 
$
283,670