Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 29, 2017	Apr. 30, 2016
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	$ 8,558	$ 5,458
Acquisitions	10,337	3,100
Impairment charges	(40)
Amortization	(463)
Translation adjustment	97
Balance at end of period	18,489	8,558
Trade Names
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	1,195	1,195
Impairment charges	(40)
Balance at end of period	1,155	1,195
Reacquired Rights
Roll-forward of other indefinite-lived intangible assets
Balance at beginning of period	7,363	4,263
Acquisitions	6,807	3,100
Amortization	(336)
Translation adjustment	(87)
Balance at end of period	13,747	$ 7,363
Other Intangible Assets
Roll-forward of other indefinite-lived intangible assets
Acquisitions	3,530
Amortization	(127)
Translation adjustment	184
Balance at end of period	$ 3,587