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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Service revenues and vehicle sales:        
Service revenues $ 203,524 $ 196,169 $ 578,842 $ 549,492
Vehicle sales 40,581 40,586 118,793 107,312
Total service revenues and vehicle sales 244,105 236,755 697,635 656,804
Operating costs and expenses:        
Yard operations 92,578 92,996 283,388 283,435
Cost of vehicle sales 36,258 34,852 104,057 90,060
General and administrative 27,325 26,863 84,560 81,474
Impairment of long-lived assets     8,771  
Total operating costs and expenses 156,161 154,711 480,776 454,969
Operating income 87,944 82,044 216,859 201,835
Other (expense) income:        
Interest expense (3,008) (1,832) (8,228) (2,265)
Interest income 78 159 259 373
Other (expense) income, net (467) (21) 1,688 1,290
Total other expense (3,397) (1,694) (6,281) (602)
Income before income taxes 84,547 80,350 210,578 201,233
Income taxes 29,076 30,214 73,355 75,379
Net Income $ 55,471 $ 50,136 $ 137,223 $ 125,854
Earnings per share-basic        
Basic net income per share $ 0.44 $ 0.36 $ 1.07 $ 0.80
Weighted average common shares outstanding 126,596 139,613 128,794 156,714
Earnings per share-diluted        
Diluted net income per share $ 0.43 $ 0.35 $ 1.04 $ 0.79
Diluted weighted average common shares outstanding 130,451 142,065 131,959 158,448