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Basis of Presentation and Accounting Policies - Segment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Jul. 26, 2014
Apr. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 26, 2014
subsidiary
segment
Jul. 27, 2013
Jul. 28, 2012
Segment Reporting Information [Line Items]                      
Number of reportable segments                 1    
Number of subsidiaries                 2    
Contract revenues $ 482,071 $ 426,284 $ 390,518 $ 512,720 $ 478,632 $ 437,367 $ 369,326 $ 323,286 $ 1,811,593 $ 1,608,612 $ 1,201,119
Canada
                      
Segment Reporting Information [Line Items]                      
Contract revenues                 $ 12,200 $ 13,000 $ 11,900