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

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Method Investments (Details) ¥ in Thousands	3 Months Ended
Equity Method Investments (Details) ¥ in Thousands	Jul. 27, 2019 USD ($)	Jul. 28, 2018 USD ($)	May 10, 2019 JPY (¥)	May 10, 2019 USD ($)	Apr. 30, 2019 USD ($)	Feb. 09, 2019 JPY (¥)	Feb. 09, 2019 USD ($)	Feb. 08, 2019	Jan. 29, 2019 JPY (¥)	Jan. 29, 2019 USD ($)	Apr. 17, 2018 JPY (¥)	Apr. 17, 2018 USD ($)	Dec. 27, 2017 JPY (¥)	Dec. 27, 2017 USD ($)
Equity Method Investments
Equity method investment loss, net of tax	$ (1,347,000)	$ (602,000)
HAPSMobile
Equity Method Investments
Ownership percentage	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			¥ 500,000	$ 4,569,000		¥ 632,800	$ 5,671,000		¥ 209,500	$ 1,926,000	¥ 150,000	$ 1,407,000	¥ 210,000	$ 1,860,000
HAPSMobile \| Equity method investment activity, net of tax
Equity Method Investments
Equity method investment loss, net of tax	$ (1,347,000)	$ (602,000)
HAPSMobile \| Other assets, long term
Equity Method Investments
Carrying value of investment	$ 9,002,000				$ 5,612,000
HAPSMobile \| SoftBank
Equity Method Investments
Ownership percentage	95.00%
AeroVironment \| HAPSMobile
Equity Method Investments
Ownership percentage	5.00%