Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2017	Jul. 31, 2016
Deferred tax assets:
Accrued expenses	$ 16.5	$ 12.1
Compensation and retirement plans	56.2	59.5
NOL and tax credit carryforwards	8.5	6.5
LIFO and inventory reserves	3.0	5.4
Other	6.9	4.0
Gross deferred tax assets	91.1	87.5
Valuation allowance	(5.2)	(3.3)
Net deferred tax assets	85.9	84.2
Deferred tax liabilities:
Depreciation and amortization	(58.8)	(57.5)
Other	(0.4)	(1.2)
Deferred tax liabilities	(59.2)	(58.7)
Net tax asset	$ 26.7	$ 25.5