Accounting For Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense associated with stock options	$ 1.3	$ 1.4
Tax benefit associated with stock options	0.4	0.4
Weighted average fair value for options granted, per share	$ 3.05	$ 10.30
Total intrinsic value of options exercised	5.7	10.7
Aggregate intrinsic value of options outstanding	100.8
Aggregate intrinsic value of options exercisable	94.3
Annual dividend yield	1.60%
2010 Master Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested stock options granted	$ 6.2
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable from date of the grant, in years	1 year
Expected volatility	18.60%
Risk-free interest rate	0.05%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable from date of the grant, in years	7 years
Expected volatility	26.70%
Risk-free interest rate	2.12%