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Recent Accounting Pronouncements - Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 25, 2018
Dec. 27, 2017
Dec. 26, 2017
Liabilities      
Deferred tax liabilities, net $ 7,102 $ 5,002 $ 5,301
Other liabilities, non-current 48,391 43,289 42,112
Equity      
Retained earnings 675,909 601,621 $ 602,499
Balances Without Adoption of ASU 2014-09      
Liabilities      
Deferred tax liabilities, net 7,398    
Other liabilities, non-current 47,223    
Equity      
Retained earnings 676,781    
ASU 2014-09 | Adoption Impact of ASU 2014-09      
Liabilities      
Deferred tax liabilities, net (296) (299)  
Other liabilities, non-current 1,168 1,177  
Equity      
Retained earnings $ (872) $ (878)