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Computation of Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 24, 2015
Oct. 25, 2014
Sep. 15, 2015
Basic earnings per unit      
Net income $ 30,824 $ 20,807  
Weighted-average number of common shares (in shares) 32,871,240 34,010,147  
Basic earnings (loss) per common share (in dollars per share) $ 0.94 $ 0.61  
Diluted earnings per unit      
Weighted-average number of common shares (in shares) 32,871,240 34,010,147  
Potential common stock arising from stock options, and unvested restricted share units (in shares) 1,015,507 1,107,526  
Total shares-diluted (in shares) 33,886,747 35,117,673  
Diluted earnings (loss) per common share (in dollars per share) $ 0.91 $ 0.59  
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 10,052,004 570,749  
Stock Compensation Plan [Member]      
Diluted earnings per unit      
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 40,536 570,749  
Convertible Debt Securities [Member]      
Diluted earnings per unit      
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 5,005,734 0.0  
Note Warrant [Member]      
Diluted earnings per unit      
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 5,005,734 0  
Convertible Note Hedge [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Debt Instrument, Convertible, Conversion Price     $ 96.89
0.75% Convertible Senior Notes Due 2021      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Debt Instrument, Convertible, Conversion Price     96.89
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 130.43