Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 25, 2014	Jul. 26, 2013
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 723	$ 137
Income taxes refunded	(5,132)	(16,200)
Income taxes (refunded) paid, net	(4,409)	(16,063)
Interest paid	$ 2,009	$ 832