Income Taxes (Schedule of Temporary Differences That Give Rise to Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Deferred tax assets
Accrued expenses	$ 12.8	$ 9.9
Compensation and retirement plans	28.3	31.8
Net operating loss (NOL) and tax credit carryforwards	7.9	8.1
Inventory reserves	2.6	3.4
Operating lease assets	12.7	18.8
Other	7.7	4.2
Gross deferred tax assets	72.0	76.2
Valuation allowance	(4.6)	(8.1)	$ (4.4)	$ (6.2)
Deferred tax assets, net of valuation allowance	67.4	68.1
Deferred tax liabilities
Depreciation and amortization	(57.0)	(47.4)
Operating lease liabilities	(12.7)	(18.8)
Other	(3.5)	(1.8)
Deferred tax liabilities	(73.2)	(68.0)
Net deferred tax (liability) asset	$ (5.8)
Net deferred tax (liability) asset		$ 0.1