Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Employee Benefit Plans [Abstract]
Service cost	$ 4,866	$ 3,870	$ 14,607	$ 11,630
Interest cost	4,222	4,866	12,733	14,607
Expected return on assets	(7,008)	(7,057)	(21,100)	(21,115)
Prior service cost amortization	162	181	482	547
Actuarial loss amortization	2,563	1,393	7,712	4,274
Net periodic benefit cost	$ 4,805	$ 3,253	$ 14,434	$ 9,943