Stock-based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
Oct. 31, 2021	Jul. 31, 2021
Shares
Outstanding, beginning balance (in shares)	7,557
Grants of options (in shares)	25
Exercises (in shares)	(146)
Forfeitures or expirations (in shares)	0
Outstanding, ending balance (in shares)	7,436	7,557
Exercisable as of October 31, 2021 (in shares)	4,507
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 56.19
Grants of options (in dollars per share)	143.23
Exercises (in dollars per share)	38.17
Forfeitures (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	56.84	$ 56.19
Exercisable as of October 31, 2021 (in dollars per share)	$ 41.08
Weighted Average Remaining Contractual Term (In years)	6 years 3 months 14 days	6 years 6 months 10 days
Weighted Average Remaining Contractual Term, exercisable (In years)	5 years 29 days
Aggregate Intrinsic Value	$ 732,121	$ 686,269
Aggregate Intrinsic Value, exercisable	$ 514,746

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.