Summary Of Significant Accounting Policies (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Summary Of Significant Accounting Policies [Abstract]
Weighted average shares - basic									145,594,300	148,273,904	150,286,403
Diluted share equivalents									2,047,000	2,181,000	2,655,000
Weighted average shares - diluted									147,641,113	150,455,193	152,940,605
Net earnings for basic and diluted earnings per share computation	$ 72,956	$ 67,336	$ 58,340	$ 61,592	$ 72,609	$ 69,842	$ 50,813	$ 54,113	$ 260,224	$ 247,377	$ 264,301
Net earnings per share - basic	$ 0.51	$ 0.46	$ 0.40	$ 0.42	$ 0.49	$ 0.47	$ 0.34	$ 0.36	$ 1.79	$ 1.67	$ 1.76
Net earnings per share - diluted	$ 0.50	$ 0.46	$ 0.39	$ 0.41	$ 0.48	$ 0.46	$ 0.34	$ 0.36	$ 1.76	$ 1.64	$ 1.73