Goodwill and Other Intangible Assets - Intangible Assets (Details) $ in Thousands	9 Months Ended
	Jan. 27, 2018 USD ($)
Roll-forward of other intangible assets
Balance at beginning of period	$ 18,489
Acquisitions	255
Amortization	(840)
Translation adjustment	606
Balance at end of period	18,510
Trade Names
Roll-forward of other intangible assets
Balance at beginning of period	1,155
Balance at end of period	1,155
Reacquired Rights
Roll-forward of other intangible assets
Balance at beginning of period	13,747
Acquisitions	255
Amortization	(533)
Translation adjustment	293
Balance at end of period	13,762
Other Intangible Assets
Roll-forward of other intangible assets
Balance at beginning of period	3,587
Amortization	(307)
Translation adjustment	313
Balance at end of period	$ 3,593