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Investments in Companies Accounted for Using the Equity Method (Details)	12 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Dec. 04, 2019 USD ($)	Dec. 04, 2019 JPY (¥)	May 11, 2019	May 10, 2019 USD ($)	May 10, 2019 JPY (¥)	Feb. 09, 2019 USD ($)	Feb. 09, 2019 JPY (¥)	Feb. 08, 2019	Jan. 29, 2019 USD ($)	Jan. 29, 2019 JPY (¥)	Apr. 17, 2018 USD ($)	Apr. 17, 2018 JPY (¥)	Dec. 27, 2017 USD ($)	Dec. 27, 2017 JPY (¥)
Equity Method Investments
Equity method investment loss, net of tax	$ (10,481,000)	$ (5,487,000)	$ (3,944,000)
Carrying value of investment	$ 7,168,000	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				$ 4,982,000	¥ 540,050,000		$ 4,569,000	¥ 500,000,000				$ 1,926,000	¥ 209,500,000	$ 1,407,000	¥ 150,000,000	$ 1,860,000	¥ 210,000,000
HAPSMobile | Equity method investment loss, net of tax
Equity Method Investments
Equity method investment loss, net of tax	$ 10,530,000	4,982,000	$ 3,944,000
HAPSMobile | Other assets, long term
Equity Method Investments
Carrying value of investment	0	$ 10,455,000
HAPSMobile | SoftBank
Equity Method Investments
Payments for purchase of interest									$ 5,671,000	¥ 632,800,000
LOON LLC
Equity Method Investments
Amount of loss from impairment of investment	$ 8,363,000

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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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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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

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