Stockholders' Equity - Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Equity [Abstract]
Proceeds from the exercise of stock options	$ 28,108	$ 39,049	$ 71,640
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value at measurement date (in dollars per share)	$ 44.94
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	0.82%	0.42%	0.29%
Risk-free interest rate, maximum	2.70%	1.23%	1.67%
Estimated volatility, minimum	27.90%	26.30%	21.70%
Estimated volatility, maximum	30.00%	28.70%	27.60%
Expected dividends (as a percent)	0.00%	0.00%	0.00%
Weighted average fair value at measurement date (in dollars per share)	$ 42.37	$ 30.43	$ 21.54
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	5 years 1 month 6 days	5 years 2 months 12 days	5 years 4 months 24 days
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years 9 months 18 days	6 years 3 months 18 days	5 years 8 months 12 days

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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