CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Service revenues and vehicle sales:
Service revenues	$ 185,647	$ 179,580
Vehicle sales	39,979	33,087
Total service revenues and vehicle sales	225,626	212,667
Operating costs and expenses:
Yard operations	96,207	95,607
Cost of vehicle sales	34,194	28,206
General and administrative	29,849	29,260
Total operating costs and expenses	160,250	153,073
Operating income	65,376	59,594
Other (expense) income:
Interest expense	(2,187)	(15)
Interest income	62	80
Other income, net	564	504
Total other (expense) income	(1,561)	569
Income before income taxes	63,815	60,163
Income taxes	22,666	22,340
Net income	$ 41,149	$ 37,823
Earnings per share-basic
Basic net income per share (in dollars per share)	$ 0.63	$ 0.45
Weighted average common shares outstanding (in shares)	65,716	83,745
Earnings per share-diluted
Diluted net income per share (in dollars per share)	$ 0.62	$ 0.45
Diluted weighted average common shares outstanding (in dollars per share)	66,901	84,406