Income Taxes (Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Jul. 31, 2018	Jul. 31, 2017
Deferred tax assets:
Accrued expenses	$ 13.2	$ 16.5
Compensation and retirement plans	29.6	56.2
NOL and tax credit carryforwards	7.2	8.5
LIFO and inventory reserves	2.3	3.0
Other	3.6	6.9
Gross deferred tax assets	55.9	91.1
Valuation allowance	(6.2)	(5.2)
Deferred tax assets, net of valuation allowance	49.7	85.9
Deferred tax liabilities:
Depreciation and amortization	(33.6)	(58.8)
Other	(1.1)	(0.4)
Deferred tax liabilities	(34.7)	(59.2)
Net deferred tax asset	$ 15.0	$ 26.7