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Discontinued Operations (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 22, 2019 USD ($) | Jun. 29, 2018 USD ($) | Oct. 31, 2020 USD ($) contract | Oct. 26, 2019 USD ($) | Oct. 31, 2020 USD ($) contract | Oct. 26, 2019 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($)
Discontinued operations |  |  |  |  |  |  |  |
Amount of alleged damages | $ 6,500,000 |  |  |  |  |  |  |
EES Business | Disposed of by sale |  |  |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |
Cash consideration received |  | $ 31,994,000 |  |  |  |  |  |
Gain on sale of business |  | 11,420,000 |  |  |  |  |  |
Amount of reduction to gain resulting from a working capital adjustment |  |  |  |  |  |  |  | $ 486,000
Working capital dispute |  |  |  |  |  |  | $ 922,000 |
Amounts recorded in the consolidated financial statements |  |  |  |  |  |  | $ 341,000 |
EES Business | Disposed of by sale | Other income (expense) |  |  |  |  |  |  |  |
Statement of operations |  |  |  |  |  |  |  |
Net Sales |  |  | $ 0 | $ 45,000 | $ 38,000 | $ 489,000 |  |
Holdback | Disposed of by sale |  |  |  |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |
Cash consideration received |  | $ 6,500,000 |  |  |  |  |  |
Number of remaining contracts | contract |  |  | 2 |  | 2 |  |  |

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