Share-based Compensation (Tables)

3 Months Ended

Oct. 31, 2011

Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]

Summary of option activity for the Company's stock options

	Shares	Weighted- average Exercise Price	Weighted-average Remaining Contractual Term	Aggregate Intrinsic Value
	(in 000s)			(in 000s)
Outstanding at July 31, 2011	8,353	$31.00
Grants of options	40	$42.09
Exercises	(86)	$29.01
Forfeitures or expirations	-	-
Outstanding at October 31, 2011	8,307	$31.08	6.95	$103,620
Exercisable at October 31, 2011	4,476	$28.93	6.09	$65,433

Stock-based compensation expense recognized

	Three Months Ended October 31,
	2011	2010
General and Administrative	$4,850	$4,331
Yard operations	195	305
	$5,045	$4,636