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Accounting Policies - Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jul. 27, 2013
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 28, 2012
Apr. 28, 2012
Jan. 28, 2012
Oct. 29, 2011
Jul. 27, 2013
Jul. 28, 2012
Jul. 30, 2011
Segment Reporting Information [Line Items]                      
Contract revenues $ 478,632 $ 437,367 $ 369,326 $ 323,286 $ 318,034 $ 296,103 $ 267,407 $ 319,575 $ 1,608,612 $ 1,201,119 $ 1,035,868
Canada
                     
Segment Reporting Information [Line Items]                      
Contract revenues $ 13,000       $ 11,900           $ 7,400