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Litigation (Details) claim in Thousands, $ in Millions | Jul. 31, 2021 USD ($) claim | Jul. 31, 2020 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |
Individual arbitration claims pending | claim | 126 |
Accrued arbitration fees |  | $ 14
Estimate of future fees to be incurred | $ 360 |

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