Stock-Based Compensation (Summary of Stock Option Activity) (Details) - $ / shares	12 Months Ended
Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Options Outstanding
Beginning Balance (in shares)	6,531,250	6,785,812	6,685,551
Granted (in shares)	944,094	908,925	881,050
Exercised (in shares)	(845,086)	(1,103,054)	(738,635)
Canceled (in shares)	(96,279)	(60,433)	(42,154)
Ending Balance (in shares)	6,533,979	6,531,250	6,785,812
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 39.66	$ 34.93	$ 32.60
Granted (in dollars per share)	51.94	58.02	45.70
Exercised (in dollars per share)	30.35	25.07	26.47
Canceled (in dollars per share)	52.72	50.57	39.52
Ending Balance (in dollars per share)	$ 42.44	$ 39.66	$ 34.93

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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