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Stock Compensation Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2026 | Jul. 31, 2025 | Jul. 31, 2024
Shares issued for stock based compensation (in shares) | 4,400,000 |  |  |  |  |
Stock based compensation award vesting period | 3 years |  |  |  |  |
Stock based compensation, shares available for grant (in shares) | 2,100,000 |  |  |  |  |
Total unrecognized compensation expense | $ 32.5 |  |  |  |  |
Share-based Payment Arrangement, Exercise of Option, Tax Benefit | $ 2.5 | $ 23.0 | $ 24.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 55.37 | $ 96.20 | $ 52.30 |  |  |
Intrinsic value of options and SARs exercised | $ 3.0 | $ 69.1 | $ 82.0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | 120,000 | 160,000 | 96,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 0.0 | $ 16.2 | $ 0.1 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Weighted-average grant-date fair value (in dollars per share) | $ 199.14 | $ 336.57 | $ 222.17 |  |  |
Stock based compensation, restricted shares granted (in shares) | 127,000 | 68,000 | 94,000 |  |  |
Stock based compensation, restricted shares vested (in shares) | 63,000 | 68,000 | 66,000 |  |  |
Stock based compensation, total fair value of restricted shares | $ 13.3 | $ 23.7 | $ 15.0 |  |  |
Expected to be Recognized in One Year [Member] | Forecast [Member] |  |  |  |  |  |
Total unrecognized compensation expense |  |  |  | $ 1.8 | $ 11.4 | $ 19.3

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Subparagraph (a) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2A + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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