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Equity Method Investments (Details) ¥ in Thousands	3 Months Ended		9 Months Ended
	Jan. 25, 2020 USD ($)	Jan. 26, 2019 USD ($)	Jan. 25, 2020 USD ($)	Jan. 26, 2019 USD ($)	Dec. 04, 2019 USD ($)	Dec. 04, 2019 JPY (¥)	Jul. 27, 2019	May 10, 2019 USD ($)	May 10, 2019 JPY (¥)	Apr. 30, 2019 USD ($)	Feb. 09, 2019 USD ($)	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	$ (1,200,000)	$ (717,000)	$ (3,410,000)	$ (2,071,000)
HAPSMobile
Equity Method Investments
Ownership percentage					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					$ 4,982,000	¥ 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		$ 717,000		$ 2,071,000
HAPSMobile | Equity method investment activity, net of tax
Equity Method Investments
Equity method investment loss, net of tax	(1,200,000)		(3,410,000)
HAPSMobile | Other assets, long term
Equity Method Investments
Carrying value of investment	$ 11,819,000		$ 11,819,000							$ 5,612,000
HAPSMobile | SoftBank
Equity Method Investments
Ownership percentage	93.00%		93.00%
AeroVironment | HAPSMobile
Equity Method Investments
Ownership percentage	7.00%		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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