Goodwill and Other Intangible Assets, Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 24, 2015	Apr. 26, 2014
Roll-forward of other intangible assets
Balance at beginning of period	$ 4,544
Acquisitions	550
Balance at end of period	5,094
Tradenames
Roll-forward of other intangible assets
Balance at beginning of period		1,306
Balance at end of period	1,306	1,306
Reacquired Rights
Roll-forward of other intangible assets
Balance at beginning of period	3,238
Acquisitions	550
Balance at end of period	$ 3,788