CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Service revenues and vehicle sales:
Service revenues	$ 723,610	$ 642,134	$ 615,352
Vehicle sales	148,636	130,745	127,730
Total service revenues and vehicle sales	872,246	772,879	743,082
Operating costs and expenses:
Yard operations	374,149	320,212	324,793
Cost of vehicle sales	125,202	104,673	106,029
General and administrative	107,605	108,924	86,935
Total operating costs and expenses	606,956	533,809	517,757
Operating income	265,290	239,070	225,325
Other income (expense):
Interest expense	(4,078)	(216)	(274)
Interest income	493	205	1,692
Other income, net	2,172	436	989
Total other income (expense)	(1,413)	425	2,407
Income from continuing operations before income taxes	263,877	239,495	227,732
Income taxes	97,502	87,868	88,186
Income from continuing operations	166,375	151,627	139,546
Discontinued operations:
Income from discontinued operations, net of income tax effects			1,557
Net income	$ 166,375	$ 151,627	$ 141,103
Earnings per share-basic
Income from continuing operations (in dollars per share)	$ 2.20	$ 1.80	$ 1.67
Income from discontinued operations (in dollars per share)			$ 0.02
Basic net income per share (in dollars per share)	$ 2.20	$ 1.80	$ 1.69
Weighted average common shares outstanding (in shares)	75,649	84,165	83,537
Earnings per share-diluted
Income from continuing operations (in dollars per share)	$ 2.17	$ 1.78	$ 1.64
Income from discontinued operations (in dollars per share)			$ 0.02
Diluted net income per share (in dollars per share)	$ 2.17	$ 1.78	$ 1.66
Diluted weighted average common shares outstanding (in shares)	76,676	85,027	84,930