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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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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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)	12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Dec. 04, 2019 JPY (¥)	Dec. 04, 2019 USD ($)	May 11, 2019	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. 27, 2017 JPY (¥)	Dec. 27, 2017 USD ($)
Equity Method Investments
Equity method investment loss, net of tax	$ (5,487,000)	$ (3,944,000)	$ (1,283,000)
Carrying value of investment	$ 4,442,000
SoftBank
Equity Method Investments
Ownership percentage	93.00%
Payments for purchase of interest \| ¥												¥ 209,500,000
HAPSMobile
Equity Method Investments
Ownership percentage	7.00%			7.00%	7.00%	5.00%	10.00%	10.00%	10.00%	10.00%	5.00%					5.00%	5.00%
Payments for purchase of interest				¥ 540,050,000	$ 4,982,000		¥ 500,000,000	$ 4,569,000				¥ 209,500,000	$ 1,926,000	¥ 150,000,000	$ 1,407,000	¥ 210,000,000	$ 1,860,000
HAPSMobile \| Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax	$ 4,982,000	3,944,000	$ 1,283,000
HAPSMobile \| Other assets, long term
Equity Method Investments
Carrying value of investment	$ 10,455,000	$ 5,612,000
HAPSMobile \| SoftBank
Equity Method Investments
Payments for purchase of interest									¥ 632,800,000	$ 5,671,000