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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, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Service revenues and vehicle sales:        
Service revenues $ 223,977 $ 200,140 $ 636,076 $ 569,808
Vehicle sales 53,661 43,965 146,613 127,827
Total service revenues and vehicle sales 277,638 244,105 782,689 697,635
Operating costs and expenses:        
Yard operations 116,410 92,578 340,693 283,388
Cost of vehicle sales 45,631 36,258 124,146 104,057
General and administrative 32,784 27,325 97,910 84,560
Impairment of long-lived assets       8,771
Total operating costs and expenses 194,825 156,161 562,749 480,776
Operating income 82,813 87,944 219,940 216,859
Other (expense) income:        
Interest expense (2,538) (3,008) (7,758) (8,228)
Interest income 138 78 485 259
Other income (expense), net 1,592 (467) 2,043 1,688
Total other expense (808) (3,397) (5,230) (6,281)
Income before income taxes 82,005 84,547 214,710 210,578
Income taxes 28,769 29,076 75,989 73,355
Net income $ 53,236 $ 55,471 $ 138,721 $ 137,223
Earnings per share-basic        
Basic net income per share (in dollars per share) $ 0.42 $ 0.44 $ 1.11 $ 1.07
Weighted average common shares outstanding (in shares) 125,270 126,596 124,755 128,794
Earnings per share-diluted        
Diluted net income per share (in dollars per share) $ 0.41 $ 0.43 $ 1.07 $ 1.04
Diluted weighted average common shares outstanding (in shares) 130,530 130,451 129,502 131,959