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Litigation (Details) claim in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Jul. 31, 2020 USD ($) | Apr. 30, 2021 USD ($) claim
Commitments and Contingencies Disclosure [Abstract] |  |
Number of pending claims | claim |  | 126
Arbitration fees | $ 14 |
Estimate of possible loss |  | $ 360

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