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Share-based Compensation, Restricted Stock and PSU (Details)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended 33 Months Ended
Jan. 08, 2017
shares
Nov. 09, 2016
USD ($)
$ / shares
Nov. 19, 2015
USD ($)
$ / shares
Sep. 26, 2017
USD ($)
$ / shares
shares
Sep. 27, 2016
USD ($)
Dec. 27, 2016
item
$ / shares
shares
Dec. 29, 2015
item
Sep. 26, 2017
USD ($)
item
$ / shares
shares
PSUs                
Share-based compensation                
Number of executives granted performance stock units | item           2 2 2
Number of common shares that a holder would receive upon meeting a performance obligation and vesting requirement (in shares) | shares       1       1
Restricted Stock Units, Shares                
Vested (in shares) | shares (188,237)              
Restricted Stock Units, Weighted-Average Grant Date Fair Value                
Granted (in dollars per share) | $ / shares   $ 39.88 $ 34.11          
Unrecognized compensation cost                
Unrecognized compensation cost of unvested stock awards (in dollars) | $       $ 1,100       $ 1,100
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards       3 months        
Share-based Compensation, other disclosures                
Vesting period           1 year 1 year  
Excess tax benefit recognized within the income tax provision | $       $ 800        
Grant date fair value | $   $ 4,600 $ 3,900          
RSUs                
Share-based compensation                
Number of common shares that a holder would receive upon satisfaction of the vesting requirement (in shares) | shares       1       1
Restricted Stock Units, Shares                
Outstanding at the beginning of the period (in shares) | shares       919,463        
Granted (in shares) | shares       349,049        
Forfeited (in shares) | shares       (35,041)        
Vested (in shares) | shares       (404,505)        
Outstanding at the end of period (in shares) | shares       828,966   919,463   828,966
Restricted Stock Units, Weighted-Average Grant Date Fair Value                
Outstanding at the beginning of the period (in dollars per share) | $ / shares       $ 37.06        
Granted (in dollars per share) | $ / shares       46.70        
Forfeited (in dollars per share) | $ / shares       37.40        
Vested (in dollars per share) | $ / shares       38.14        
Outstanding at the end of the period (in dollars per share) | $ / shares       $ 40.57   $ 37.06   $ 40.57
Weighted-Average Remaining Contractual Term (years)                
Weighted-Average Remaining Contractual Term       1 year 2 months 12 days        
Aggregate Intrinsic Value                
Outstanding at the end of the period (in dollars) | $       $ 39,991       $ 39,991
Intrinsic value of awards vested (in dollars) | $       18,800 $ 17,400      
Unrecognized compensation cost                
Unrecognized compensation cost of unvested stock awards (in dollars) | $       $ 17,400       $ 17,400
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards       1 year 2 months 12 days        
Share-based Compensation, other disclosures                
Excess tax benefit recognized within the income tax provision | $       $ 1,200        
Excess tax benefit recorded in additional paid-in capital | $         $ 1,200      
RSUs | Minimum                
Share-based Compensation, other disclosures                
Vesting period       1 year        
RSUs | Maximum                
Share-based Compensation, other disclosures                
Vesting period       5 years