Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Current:
Federal	$ 18,300	$ (19)	$ 5,876
Foreign	7,501	9,207	11,228
State	4,959	3,402	2,243
Total current expense	30,760	12,590	19,347
Deferred:
Federal	(25,918)	9,709	(45,177)
Foreign	164	(53)	(743)
State	(6,046)	1,106	4,862
Total deferred (benefit) expense	(31,800)	10,762	(41,058)
Income tax (benefit) expense	$ (1,040)	$ 23,352	$ (21,711)