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Condensed Consolidated Statements of Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Service revenues and vehicle sales:        
Service revenues $ 216,920 $ 186,852 $ 412,099 $ 369,668
Vehicle sales 49,265 41,052 92,952 83,862
Total service revenues and vehicle sales 266,185 227,904 505,051 453,530
Operating costs and expenses:        
Yard operations 127,164 94,603 224,283 190,810
Cost of vehicle sales 42,204 33,605 78,515 67,799
General and administrative 34,047 27,386 65,126 57,235
Impairment of long-lived assets   8,771   8,771
Total operating costs and expenses 203,415 164,365 367,924 324,615
Operating income 62,770 63,539 137,127 128,915
Other (expense) income:        
Interest expense (2,588) (3,033) (5,220) (5,220)
Interest income 191 119 347 181
Other income, net 744 1,591 451 2,155
Total other expense (1,653) (1,323) (4,422) (2,884)
Income before income taxes 61,117 62,216 132,705 126,031
Income taxes 21,477 21,613 47,220 44,279
Net income $ 39,640 $ 40,603 $ 85,485 $ 81,752
Earnings per share-basic        
Basic net income per share (in dollars per share) $ 0.32 $ 0.32 $ 0.69 $ 0.63
Weighted average common shares outstanding (in shares) 124,709 128,306 124,505 129,870
Earnings per share-diluted        
Diluted net income per share (in dollars per share) $ 0.31 $ 0.31 $ 0.66 $ 0.62
Diluted weighted average common shares outstanding (in shares) 129,520 131,590 128,997 132,696