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Equity Method Investments (Details) ¥ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2020 USD ($) | Jan. 26, 2019 USD ($) | Jan. 25, 2020 USD ($) | Jan. 26, 2019 USD ($) | Dec. 04, 2019 USD ($) | Dec. 04, 2019 JPY (¥) | Jul. 27, 2019 | May 10, 2019 USD ($) | May 10, 2019 JPY (¥) | Apr. 30, 2019 USD ($) | Feb. 09, 2019 USD ($) | 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 | $ (1,200,000) | $ (717,000) | $ (3,410,000) | $ (2,071,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 7.00% | 7.00% | 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 |  |  |  |  | $ 4,982,000 | ¥ 540,050 |  | $ 4,569,000 | ¥ 500,000 |  | $ 5,671,000 | ¥ 632,800 |  | $ 1,926,000 | ¥ 209,500 | $ 1,407,000 | ¥ 150,000 | $ 1,860,000 | ¥ 210,000
HAPSMobile | Equity method investment loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment loss, net of tax |  | $ 717,000 |  | $ 2,071,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Equity method investment activity, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment loss, net of tax | (1,200,000) |  | (3,410,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HAPSMobile | Other assets, long term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment | $ 11,819,000 |  | $ 11,819,000 |  |  |  |  |  |  | $ 5,612,000 |  |  |  |  |  |  |  |  |
HAPSMobile | SoftBank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 93.00% |  | 93.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AeroVironment | HAPSMobile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 7.00% |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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