Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Details)

v3.20.2
Shareholders' Equity (Details)
 1 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
$ / shares
shares
Sep. 26, 2020
USD ($)
vote
$ / shares
shares
Sep. 28, 2019
USD ($)
$ / shares
shares
Sep. 29, 2018
USD ($)
Aug. 31, 2019
USD ($)
Sep. 24, 2011
USD ($)
Class of Stock [Line Items]            
Preferred stock authorized (in shares)   1,000,000 1,000,000      
Preferred stock, par value (in usd per share) | $ / shares   $ 0.01 $ 0.01      
Preferred stock, shares outstanding   0 0      
Proceeds from issuance of common stock, net of offering costs | $   $ 0 $ 0 $ 195,631,000    
Repurchased of stock | $   52,254,000 $ 58,115,000      
2019 Repurchase Authorization            
Class of Stock [Line Items]            
Stock repurchase program, authorized amount | $         $ 100,000,000  
Stock repurchase program remaining authorized amount | $   $ 100,000,000        
Equity Dilution Authorization            
Class of Stock [Line Items]            
Stock repurchase, remaining authorization (in shares)   700,000        
Common stock            
Class of Stock [Line Items]            
Common stock authorized (in shares)   80,000,000 80,000,000      
Common stock, par value (in usd per share) | $ / shares   $ 0.01 $ 0.01      
Common stock, shares outstanding (in shares)   11,336,358 11,543,969      
Stock repurchase program, authorized amount | $           $ 100,000,000
Repurchased of stock (in shares)   200,000        
Repurchased of stock | $   $ 6,600,000        
Repurchases of stock (in usd per share) | $ / shares   $ 26.63        
Class A common stock            
Class of Stock [Line Items]            
Common stock authorized (in shares)   100,000,000 100,000,000      
Common stock, par value (in usd per share) | $ / shares   $ 0.01 $ 0.01      
Common stock, shares outstanding (in shares)   41,856,626 42,968,493      
Shares issued and sold (in shares) 5,500,000          
Shares issued and sold (in usd per share) | $ / shares $ 37.00          
Shares issued upon exercise of option (in shares) 550,000          
Proceeds from issuance of common stock, net of offering costs | $ $ 195,600,000          
Class B stock            
Class of Stock [Line Items]            
Common stock authorized (in shares)   3,000,000 3,000,000      
Common stock, par value (in usd per share) | $ / shares   $ 0.01 $ 0.01      
Common stock, shares outstanding (in shares)   1,612,374 1,652,262      
Percentage of vote cast for shares (percent)   49.00%        
Convertible shares conversion ratio   1        
Non voting common stock            
Class of Stock [Line Items]            
Repurchased of stock (in shares)   1,800,000        
Repurchased of stock | $   $ 45,700,000        
Repurchases of stock (in usd per share) | $ / shares   $ 25.90        
Minimum | Class B stock            
Class of Stock [Line Items]            
Number of voting powers | vote   1        
Maximum | Class B stock            
Class of Stock [Line Items]            
Number of voting powers | vote   10