Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Employee Benefit Plans [Abstract]
Service cost	$ 3,870	$ 4,077	$ 11,630	$ 12,151
Interest cost	4,866	4,872	14,607	14,533
Expected return on assets	(7,057)	(6,920)	(21,115)	(20,616)
Transition amount amortization	54	58	165	167
Prior service cost amortization	127	119	382	347
Actuarial loss amortization	1,393	839	4,274	2,491
Net periodic benefit cost	$ 3,253	$ 3,045	$ 9,943	$ 9,073