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Equity Method Investments - Investment in Limited Partnership Fund (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jul. 15, 2020	Oct. 31, 2020	Oct. 26, 2019	Oct. 31, 2020	Oct. 26, 2019	Apr. 30, 2020
Equity Method Investments
Equity method investment loss, net of tax		$ (9,522)	$ (863)	$ (10,810)	$ (2,210)
Provision for income taxes		2,491	1,108	3,698	3,241
Carrying value of investment		5,335		5,335		$ 4,442
Limited Partnership Fund
Equity Method Investments
Capital contributions	$ 1,173	3,880
Limited Partnership Fund \| Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax			0		0
HAPSMobile \| Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax		$ 0	$ 863	$ 280	$ 2,210