Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Service cost	$ 4,500	$ 5,100	$ 9,100	$ 10,300
Interest cost	4,800	4,900	9,500	9,700
Expected return on assets	(7,200)	(7,500)	(14,500)	(14,900)
Prior service cost and transition amortization	100	100	300	300
Settlement cost	0	3,900	0	3,900
Actuarial loss amortization	2,100	1,900	4,300	3,700
Net periodic benefit cost	$ 4,300	$ 8,400	$ 8,700	$ 13,000