Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Employee Benefit Plans [Abstract]
Service cost	$ 4,702	$ 4,880	$ 9,385	$ 9,741
Interest cost	4,863	4,263	9,717	8,511
Expected return on assets	(7,656)	(7,055)	(15,279)	(14,092)
Prior service cost and transition amortization	148	161	296	320
Actuarial loss amortization	1,850	2,577	3,698	5,149
Net periodic benefit cost	$ 3,907	$ 4,826	$ 7,817	$ 9,629