Equity Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, granted (in shares)	0
Pre-tax stock-based compensation expense associated with stock options	$ 1.1	$ 1.1
Tax benefit associated with stock options	0.3	0.3
Total intrinsic value of options exercised	3.4	$ 1.0
Aggregate intrinsic value of options outstanding	46.5
Aggregate intrinsic value of options exercisable	38.8
2010 Master Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested stock options granted	$ 5.0