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Equity Method Investments (Details) ¥ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020 USD ($)	Oct. 26, 2019 USD ($)	Oct. 31, 2020 USD ($)	Oct. 26, 2019 USD ($)	Apr. 30, 2020 USD ($)	Dec. 04, 2019 USD ($)	Dec. 04, 2019 JPY (¥)	Jul. 27, 2019	May 10, 2019 USD ($)	May 10, 2019 JPY (¥)	Apr. 30, 2019	Feb. 09, 2019 USD ($)	Feb. 09, 2019 JPY (¥)	Feb. 08, 2019	Jan. 29, 2019 USD ($)	Jan. 29, 2019 JPY (¥)	Apr. 17, 2018 USD ($)	Apr. 17, 2018 JPY (¥)	Dec. 27, 2017 USD ($)	Dec. 27, 2017 JPY (¥)
Equity Method Investments
Equity method investment loss, net of tax	$ (9,522)	$ (863)	$ (10,810)	$ (2,210)
Carrying value of investment	5,335		5,335		$ 4,442
HAPSMobile
Equity Method Investments
Ownership percentage		5.00%		5.00%		7.00%	7.00%	5.00%	10.00%	10.00%	10.00%	10.00%	10.00%	5.00%	5.00%	5.00%			5.00%	5.00%
Payments for purchase of interest						$ 4,982	¥ 540,050		$ 4,569	¥ 500,000		$ 5,671	¥ 632,800		$ 1,926	¥ 209,500	$ 1,407	¥ 150,000	$ 1,860	¥ 210,000
HAPSMobile | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax	0	$ 863	280	$ 2,210
HAPSMobile | Equity method investment activity, net of tax
Equity Method Investments
Equity method investment loss, net of tax	(9,522)			$ (10,810)
HAPSMobile | Other assets, long term
Equity Method Investments
Carrying value of investment	$ 0		$ 0		$ 10,455
HAPSMobile | SoftBank
Equity Method Investments
Ownership percentage	93.00%		93.00%
HAPSMobile | Aerovironment
Equity Method Investments
Ownership percentage	7.00%		7.00%
LOON LLC
Equity Method Investments
Amount of loss from impairment of investment	$ 8,363

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