Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Employee Benefit Plans [Abstract]
Service cost	$ 4,861	$ 3,898
Interest cost	4,248	4,893
Expected return on assets	(7,037)	(7,053)
Transition amount amortization	52	57
Prior service cost amortization	107	128
Actuarial loss amortization	2,572	1,443
Net periodic benefit cost	$ 4,803	$ 3,366