Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 25, 2015
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	$ 5,458	$ 4,544
Acquisitions	3,100	1,025
Impairment charges		(111)
Balance at end of period	8,558	5,458
Trade Names
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	1,195	1,306
Impairment charges		(111)
Balance at end of period	1,195	1,195
Reacquired rights
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	4,263	3,238
Acquisitions	3,100	1,025
Balance at end of period	$ 7,363	$ 4,263