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Stock Compensation Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021
Shares issued for stock based compensation (in shares) | 4,400,000 |  |  |  |  |
Stock based compensation award life | 10 years |  |  |  |  |
Stock based compensation award vesting period | 3 years |  |  |  |  |
Stock based compensation, shares available for grant (in shares) | 3,200,000 |  |  |  |  |
Total unrecognized compensation expense | $ 25.9 |  |  |  |  |
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | $ 12.3 | $ 16.3 | $ 79.7 |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 58.25 | $ 98.19 | $ 78.07 |  |  |
Intrinsic value of options and SARs exercised | $ 35.0 | $ 41.2 | $ 213.8 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 91,000 | 131,000 | 169,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 2.6 | $ 15.2 | $ 18.5 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 217.46 | $ 264.44 | $ 215.14 |  |  |
Stock based compensation, restricted shares granted (in shares) | 83,000 | 68,000 | 77,000 |  |  |
Stock based compensation, restricted shares vested (in shares) | 63,000 | 102,000 | 101,000 |  |  |
Stock based compensation, total fair value of restricted shares | $ 14.8 | $ 28.8 | $ 23.5 |  |  |
Expected to be Recognized in One Year [Member] | Forecast [Member] |  |  |  |  |  |
Total unrecognized compensation expense |  |  |  | $ 1.2 | $ 9.0 | $ 15.7

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