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Equity Method Investments (Details) ¥ in Thousands | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
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% |  |  |  |  |  |  |  |  |  |  |  |  |

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