Stock-Based Compensation (Stock Option Grants) (Details) (USD $)	0 Months Ended
	Apr. 30, 2014 2014 Plan [Member] Employee Stock Option [Member]		Jul. 31, 2013 2011 Plan [Member] Chief Executive Officer [Member]		Feb. 20, 2013 2011 Plan [Member] Chief Executive Officer [Member]		Jul. 31, 2013 1999 Plan [Member] Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options Granted	161,000	[1]	446,000	[2]	161,000	[2]	149,000	[3]
Exercise Price	$ 28.89	[1]	$ 28.09	[2]	$ 26.52	[2]	$ 28.01	[3]
Fair Value	$ 6.26	[1]	$ 8.46	[2]	$ 8.38	[2]	$ 6.79	[3]

[1] Options granted under the 2014 Plan based on daily closing stock prices.

[2] Option granted under the 2011 Plan based on daily closing stock prices.

[3] Option granted under the 1999 Plan based on daily average of high and low stock prices.