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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 02, 2018
Dec. 27, 2017
Dec. 02, 2017
Dec. 03, 2016
Jan. 09, 2018
Sep. 02, 2017
Components Of Shareholders Equity [Line Items]            
Regular dividends cash paid     $ 27,087 $ 25,495    
Purchase of treasury stock     $ 4,018      
Preferred stock, shares authorized     5,000,000     5,000,000
Preferred stock, shares issued     0     0
Preferred stock, shares outstanding     0     0
Subsequent Event [Member]            
Components Of Shareholders Equity [Line Items]            
Dividends declared date Jan. 02, 2018          
Dividends payable per share $ 0.58          
Dividend payable date Jan. 30, 2018          
Dividends record date Jan. 16, 2018          
Dividend payable amount   $ 32,745        
Regular Dividends [Member]            
Components Of Shareholders Equity [Line Items]            
Cash dividends paid per common share     $ 0.48 $ 0.45    
Regular dividends cash paid     $ 27,087 $ 25,495    
Class A Common Stock [Member] | Subsequent Event [Member]            
Components Of Shareholders Equity [Line Items]            
Maximum number of shares that can be repurchased         2,800,000  
Class A Treasury Stock [Member]            
Components Of Shareholders Equity [Line Items]            
Common stock shares repurchased     51,000      
Purchase of treasury stock     $ 4,018      
Class A Treasury Stock [Member] | Subsequent Event [Member]            
Components Of Shareholders Equity [Line Items]            
Number of shares authorized for repurchase         2,000,000