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Stock Incentive Plan - Stock Options Narrative (Details)
12 Months Ended
Jul. 27, 2016
USD ($)
employee
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Sep. 25, 2015
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reclassified from non-current liabilities to additional-paid-in-capital     $ 43,870,000  
Issuance of common stock   $ 12,168,000 52,000 $ 49,000
Cash paid to settle options exercised   $ 0 $ 43,000 $ 914,000
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value of options granted | $ / shares   $ 8.84 $ 7.63 $ 9.09
Exercised, aggregate intrinsic value   $ 25,757,000 $ 43,000 $ 914,000
Unrecognized compensation expense   $ 8,399,000    
Weighted-average period   1 year 7 months 21 days    
Fair value of shares vested   $ 10,696,000 12,507,000 2,787,000
Tax benefit for tax deductions from stock options exercised   $ 9,530 $ 19 $ 18
Omnibus Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of employees | employee 63      
Omnibus Incentive Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Reclassified from non-current liabilities to additional-paid-in-capital $ 43,870,000      
Additional expense $ 2,400,000      
Stock Incentive Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   5 years