Stock Compensation Plan (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended													12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2013 Stock Appreciation Rights (SARs) [Member]	Jul. 31, 2012 Stock Appreciation Rights (SARs) [Member]	Jul. 31, 2011 Stock Appreciation Rights (SARs) [Member]	Jul. 31, 2013 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2012 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2011 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2013 Scenario, Forecast [Member]	Jul. 31, 2014 Expected to be Recognized in 2011 [Member] Scenario, Forecast [Member]	Jul. 31, 2015 Expected to be Recognized in 2012 [Member] Scenario, Forecast [Member]	Jul. 31, 2016 Expected to be Recognized in 2013 [Member] Scenario, Forecast [Member]	Jul. 31, 2013 Maximum [Member]	Jul. 31, 2013 Minimum [Member]
Shares issued for stock based compensation (in shares)	7,500,000
Stock based compensation award life	10 years
Stock based compensation award vesting period	3 years
Stock based compensation, shares available for grant (in shares)	2,600,000
Stock based compensation, estimated forfeiture rates														21.00%	9.90%
Weighted-average grant-date fair value (in dollars per share)				$ 18.38	$ 12.71	$ 13.84	$ 52.94	$ 38.15	$ 37.03
Intrinsic value of options and SARs exercised				$ 18.6	$ 1.3	$ 2.0
Options and SARs that vested during the period (in shares)				414,000	930,000	288,000
Total fair value of options vested during the period				6.5	10.7	0.7
Stock based compensation, restricted shares granted (in shares)							159,000	180,000	201,000
Stock based compensation, restricted shares vested (in shares)							134,000	234,000	143,000
Stock based compensation, total fair value of restricted shares							5.0	9.2	5.9
Total unrecognized compensation expense										16.0	9.5	5.6	0.9
Cash received from exercise of stock option	3.0	0.5	1.1
Tax benefit from exercise of stock options	$ 9.8	$ 3.9	$ 2.5