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Litigation (Details) claim in Thousands, $ in Millions	Jul. 31, 2021 USD ($) claim	Jul. 31, 2020 USD ($)
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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Amount of loss contingency liability.

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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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-Publisher FASB
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Number of pending claims pertaining to a loss contingency.

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