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Segments and Other Geographic Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 30, 2010
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract]                      
Revenues $ 226,556 [1],[2] $ 244,105 [1],[2] $ 227,904 [1],[2] $ 225,626 [1],[2] $ 215,443 [1],[2],[3] $ 236,755 [1],[2],[3] $ 207,380 [1],[2],[3] $ 212,667 [1],[2],[3] $ 924,191 $ 872,246 $ 772,879
Long-lived assets 606,070       621,775       606,070 621,775  
United States
                      
Segment Reporting Information, Profit (Loss) [Abstract]                      
Revenues                 724,869 674,742 602,794
Long-lived assets 510,366       521,558       510,366 521,558  
Canada
                      
Segment Reporting Information, Profit (Loss) [Abstract]                      
Revenues                 6,626 6,532 5,635
Long-lived assets 4,161       4,579       4,161 4,579  
North America
                      
Segment Reporting Information, Profit (Loss) [Abstract]                      
Revenues                 731,495 681,274 608,429
Long-lived assets 514,527       526,137       514,527 526,137  
United Kingdom
                      
Segment Reporting Information, Profit (Loss) [Abstract]                      
Revenues                 192,696 190,972 164,450
Long-lived assets $ 91,543       $ 95,638       $ 91,543 $ 95,638  
[1] Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.
[2] All per share amounts have been revised to reflect the impact of the two-for-one stock split effected in the form of a stock dividend, which issued one additional share of common stock to each share of common stock outstanding on March 23, 2012.
[3] Fiscal 2011 results are impacted from the adoption of ASU 2009-13.