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Quarterly Financial Data (Unaudited) (Tables)
12 Months Ended
Jul. 29, 2011
Quarterly Financial Data (Unaudited) [Abstract]  
Quarterly financial data
Quarterly financial data for 2011 and 2010 are summarized as follows:

   
1st Quarter
  
2nd Quarter
  
3rd Quarter
 
4th Quarter
2011
          
Total revenue
 $598,691  $640,277  $582,525 $612,942
Gross profit
  418,938   420,887   402,751  419,388
Income before income taxes
  33,702   40,642   19,586  21,761
Income from continuing operations
  23,734   28,777   15,154  17,543
Net income
  23,734   28,777   15,154  17,543
Income from continuing operations per share - basic
 $1.04  $1.24  $0.66 $0.77
Net income per share – basic
 $1.04  $1.24  $0.66 $0.77
Income from continuing operations per share – diluted
 $1.01  $1.20  $0.64 $0.75
Net income per share – diluted
 $1.01  $1.20  $0.64 $0.75
2010
              
Total revenue
 $581,183  $632,616  $578,233 $612,483
Gross profit
  403,712   420,718   405,192  429,075
Income before income taxes
  26,215   36,092   19,645  33,757
Income from continuing operations
  18,024   25,393   14,428  27,413
Net income
  18,024   25,393   14,428  27,413
Income from continuing operations per share - basic
 $0.79  $1.11  $0.62 $1.18
Net income per share – basic
 $0.79  $1.11  $0.62 $1.18
Income from continuing operations per share – diluted
 $0.78  $1.09  $0.61 $1.14
Net income per share – diluted
 $0.78  $1.09  $0.61 $1.14