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Equity Method Investments (Details) ¥ in Thousands	3 Months Ended
	Aug. 01, 2020 USD ($)	Jul. 27, 2019 USD ($)	Apr. 30, 2020 USD ($)	Dec. 04, 2019 USD ($)	Dec. 04, 2019 JPY (¥)	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	$ (1,288,000)	$ (1,347,000)
Carrying value of investment	5,334,000		$ 4,442,000
HAPSMobile
Equity Method Investments
Ownership percentage		5.00%		7.00%	7.00%	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				$ 4,982,000	¥ 540,050	$ 4,569,000	¥ 500,000		$ 5,671,000	¥ 632,800		$ 1,926,000	¥ 209,500	$ 1,407,000	¥ 150,000	$ 1,860,000	¥ 210,000
HAPSMobile | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax	280,000	$ 0
HAPSMobile | Equity method investment activity, net of tax
Equity Method Investments
Equity method investment loss, net of tax	(1,008,000)	$ (1,347,000)
HAPSMobile | Other assets, long term
Equity Method Investments
Carrying value of investment	$ 9,522,000		$ 10,455,000
HAPSMobile | SoftBank
Equity Method Investments
Ownership percentage	93.00%
HAPSMobile | Aerovironment
Equity Method Investments
Ownership percentage	7.00%

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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