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Stock Compensation Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2029	Jul. 31, 2028	Jul. 31, 2027
Shares issued for stock based compensation (in shares)	1,500,000
Stock based compensation award vesting period	3 years
Stock based compensation, shares available for grant (in shares)	900,000
Total unrecognized compensation expense	$ 39.2
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)	$ 32.21	$ 41.96	$ 60.03
Intrinsic value of options and SARs exercised		$ 3.6	$ 0.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	114,000	219,000	119,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 0.0	$ 0.0	$ 0.9
Restricted Stock Units (RSUs) [Member]
Weighted-average grant-date fair value (in dollars per share)	$ 129.77	$ 162.05	$ 204.68
Stock based compensation, restricted shares granted (in shares)	248,000	172,000	132,000
Stock based compensation, restricted shares vested (in shares)	101,000	116,000	80,000
Stock based compensation, total fair value of restricted shares	$ 14.9	$ 20.0	$ 18.4
Expected to be Recognized in One Year [Member] \| Forecast [Member]
Total unrecognized compensation expense				$ 2.6	$ 13.7	$ 22.9