Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Employee Benefit Plans [Abstract]
Service cost	$ 15,464	$ 16,148	$ 13,184
Interest cost	19,436	19,440	19,445
Expected return on assets	(28,114)	(27,538)	(28,390)
Transition amount amortization	216	225	226
Prior service cost amortization	509	449	293
Actuarial loss amortization	5,696	3,962	2,864
Net periodic benefit cost	$ 13,207	$ 12,686	$ 7,622