Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Current:
Federal	$ (19)	$ 5,876	$ 72,339
Foreign	9,207	11,228	9,100
State	3,402	2,243	9,367
Total current expense	12,590	19,347	90,806
Deferred:
Federal	9,709	(45,177)	(11,802)
Foreign	(53)	(743)	(28)
State	1,106	4,862	(1,883)
Total deferred expense (benefit)	10,762	(41,058)	(13,713)
Income tax expense (benefit)	$ 23,352	$ (21,711)	$ 77,093