Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 25, 2014	Apr. 26, 2013	Apr. 27, 2012
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of fiscal year	$ 9,554	$ 11,045	$ 11,340
Additions based on tax positions related to the current year	31	366	600
Additions for tax positions of prior years	1,004	123	2,615
Reductions for tax positions of prior years	(25)	(271)	(706)
Reductions due to settlements with taxing authorities	(1,423)	(799)	(1,936)
Reductions due to statute of limitations expiration	(3,189)	(910)	(868)
Balance at end of fiscal year	$ 5,952	$ 9,554	$ 11,045