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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Investments in Companies Accounted for Using the Equity Method (Details)	3 Months Ended	12 Months Ended
	Jul. 29, 2017 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2020	May 10, 2019 JPY (¥)	May 10, 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. 31, 2017	Dec. 27, 2017 JPY (¥)	Dec. 27, 2017 USD ($)
Equity Method Investments
Equity method investment loss, net of tax	$ (1,283,000)	$ (3,944,000)	$ (1,283,000)	$ (119,000)
SoftBank
Equity Method Investments
Ownership percentage															90.00%
Payments for purchase of interest											¥ 209,500,000	$ 1,926,000	¥ 150,000,000	$ 1,407,000
HAPSMobile
Equity Method Investments
Ownership percentage		10.00%			5.00%	10.00%	10.00%	10.00%	10.00%	5.00%					10.00%
Payments for purchase of interest																¥ 210,000,000	$ 1,860,000
HAPSMobile \| Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax		$ 3,944,000	1,283,000
HAPSMobile \| Other assets, long term
Equity Method Investments
Carrying value of investment		$ 5,612,000	$ 2,020,000
HAPSMobile \| SoftBank
Equity Method Investments
Payments for purchase of interest						¥ 500,000,000	$ 4,569,000	¥ 632,800,000	$ 5,671,000