Income Taxes (Temporary Differences That Give Rise to Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Deferred tax assets
Accrued expenses	$ 12.2	$ 11.6
Compensation and retirement plans	24.7	26.4
Capitalization of R&D costs	17.6	0.0
Net operating loss (NOL) and tax credit carryforwards	15.1	6.4
Operating lease assets	15.0	11.6
Other	6.2	6.4
Gross deferred tax assets	90.8	62.4
Valuation allowance	(6.4)	(3.4)	$ (4.6)	$ (8.1)
Deferred tax assets, net of valuation allowance	84.4	59.0
Deferred tax liabilities
Depreciation and amortization	(79.5)	(57.0)
Operating lease liabilities	(15.1)	(11.6)
Other	(4.2)	(2.4)
Deferred tax liabilities	(98.8)	(71.0)
Net deferred tax liability	$ (14.4)	$ (12.0)