Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Employee Benefit Plans [Abstract]
Service cost	$ 4,683	$ 4,861
Interest cost	4,854	4,248
Expected return on assets	(7,623)	(7,037)
Prior service cost and transition amortization	148	159
Actuarial loss amortization	1,848	2,572
Net periodic benefit cost	$ 3,910	$ 4,803