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Equity Methods Investments - Investment in Limited Partnership Fund (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Oct. 30, 2021	Oct. 31, 2020	Apr. 30, 2021
Equity Method Investments
Equity method investment income (loss), net of tax	$ 1,133	$ (9,522)	$ (8)	$ (10,810)
Carrying value of investment	11,271		11,271		$ 7,168
Limited Partnership Fund
Equity Method Investments
Capital contributions			1,738	1,173
Additional capital contributions			639
Limited Partnership Fund | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment income (loss), net of tax	1,852	0	2,365	(280)
Income tax expense from equity method investments			529
Limited Partnership Fund | Long term investments
Equity Method Investments
Carrying value of investment	$ 11,271		$ 11,271		$ 7,168
HAPSMobile
Equity Method Investments
Equity method investment income (loss), net of tax				$ (10,810)
HAPSMobile | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment income (loss), net of tax		$ (9,522)

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Cash outflow related to the acquisition or continued holding of limited partnership interests held for investment purposes.

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