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Equity Method Investments (Details) ¥ in Thousands, $ in Thousands						3 Months Ended
	Aug. 13, 2021 USD ($)	Aug. 13, 2021 JPY (¥)	Jul. 02, 2021 USD ($)	Jul. 02, 2021 JPY (¥)	May 29, 2021 USD ($)	Jul. 31, 2021 USD ($)	Aug. 01, 2020 USD ($)	May 29, 2021 JPY (¥)	Apr. 30, 2021 USD ($)	Dec. 04, 2019 USD ($)	Dec. 04, 2019 JPY (¥)	May 10, 2019 USD ($)	May 10, 2019 JPY (¥)	Feb. 09, 2019 USD ($)	Feb. 09, 2019 JPY (¥)	Feb. 08, 2019	Jan. 29, 2019 USD ($)	Jan. 29, 2019 JPY (¥)	May 09, 2018	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						$ (1,141)	$ (1,288)
Carrying value of investment						9,178			$ 7,168
HAPSMobile
Equity Method Investments
Ownership percentage										7.00%	7.00%	5.00%	5.00%	10.00%	10.00%	5.00%	5.00%	5.00%	10.00%			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						415
HAPSMobile | Equity method investment activity, net of tax
Equity Method Investments
Equity method investment loss, net of tax						(1,655)	$ (1,008)
HAPSMobile | Other current liabilities
Equity Method Investments
Carrying value of investment						$ 415
HAPSMobile | Other assets, long term
Equity Method Investments
Carrying value of investment									$ 10,455
HAPSMobile | SoftBank
Equity Method Investments
Ownership percentage						93.00%
HAPSMobile | Aerovironment
Equity Method Investments
Ownership percentage						7.00%
MDDA
Equity Method Investments
Term of MDDA					5 years
MDDA | SoftBank
Equity Method Investments
Maximum value under MDDA					$ 51,200
MDDA | HAPSMobile
Equity Method Investments
Execution of MDDA					$ 4,600			¥ 500,000
Amount funded	$ 1,638	¥ 180,000	$ 1,195	¥ 130,000

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