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Equity Method Investments (Details) ¥ in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |
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Oct. 29, 2021 USD ($) | Oct. 29, 2021 JPY (¥) | Aug. 13, 2021 USD ($) | Aug. 13, 2021 JPY (¥) | Jul. 02, 2021 USD ($) | Jul. 02, 2021 JPY (¥) | May 29, 2021 USD ($) | Oct. 30, 2021 USD ($) | Oct. 31, 2020 USD ($) | Oct. 30, 2021 USD ($) | Oct. 31, 2020 USD ($) | May 29, 2021 JPY (¥) | Apr. 30, 2021 USD ($) | Dec. 04, 2019 USD ($) | Dec. 04, 2019 JPY (¥) | May 10, 2019 USD ($) | May 10, 2019 JPY (¥) | Feb. 09, 2019 USD ($) | Feb. 09, 2019 JPY (¥) | Feb. 08, 2019 | Jan. 29, 2019 USD ($) | Jan. 29, 2019 JPY (¥) | May 09, 2018 | Apr. 17, 2018 USD ($) | Apr. 17, 2018 JPY (¥) | Dec. 27, 2017 USD ($) | Dec. 27, 2017 JPY (¥)
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment income (loss), net of tax |  |  |  |  |  |  |  | $ 1,133 | $ (9,522) | $ (8) | $ (10,810) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment |  |  |  |  |  |  |  | 11,271 |  | 11,271 |  |  | $ 7,168 |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% | 7.00% | 5.00% | 5.00% | 10.00% | 10.00% | 5.00% | 5.00% | 5.00% | 10.00% |  |  | 5.00% | 5.00%
Payments for purchase of interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,982 | ¥ 540,050 | $ 4,569 | ¥ 500,000 | $ 5,671 | ¥ 632,800 |  | $ 1,926 | ¥ 209,500 |  | $ 1,407 | ¥ 150,000 | $ 1,860 | ¥ 210,000
Equity method investment income (loss), net of tax |  |  |  |  |  |  |  |  |  |  | (10,810) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Equity method investment loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loss from impairment of investment |  |  |  |  |  |  |  |  |  |  | $ 8,363 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment income (loss), net of tax |  |  |  |  |  |  |  |  | $ (9,522) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Equity method investment activity, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment income (loss), net of tax |  |  |  |  |  |  |  | (190) |  | (1,845) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Other assets, long term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment |  |  |  |  |  |  |  | $ 2,661 |  | $ 2,661 |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | SoftBank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 93.00% |  | 93.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Aerovironment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 7.00% |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of MDDA |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDDA | SoftBank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum value under MDDA |  |  |  |  |  |  | $ 51,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MDDA | HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Execution of MDDA | ¥ |  |  |  |  |  |  |  |  |  |  |  | ¥ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded | $ 1,674 | ¥ 190,000 | $ 1,638 | ¥ 180,000 | $ 1,195 | ¥ 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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