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Equity Method Investments - Investment in Limited Partnership Fund (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 15, 2020	Aug. 01, 2020	Jul. 27, 2019	Apr. 30, 2020
Equity Method Investments
Equity method investment loss, net of tax		$ (1,288)	$ (1,347)
Provision for income taxes		1,207	2,133
Carrying value of investment		5,334		$ 4,442
Limited Partnership Fund
Equity Method Investments
Capital contributions	$ 1,173	3,880
HAPSMobile \| Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax		$ 280	$ 0