Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Employee Benefit Plans [Abstract]
Service cost	$ 4,880	$ 3,862	$ 9,741	$ 7,760
Interest cost	4,263	4,848	8,511	9,741
Expected return on assets	(7,055)	(7,005)	(14,092)	(14,058)
Prior service cost and transition amortization	161	181	320	366
Actuarial loss amortization	2,577	1,438	5,149	2,881
Net periodic benefit cost	$ 4,826	$ 3,324	$ 9,629	$ 6,690