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Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
Class A Common Stock [Member]
Common Stock [Member]
Class A Common Stock [Member]
Retained Earnings [Member]
Class A Common Stock [Member]
Class B Common Stock [Member]
Common Stock [Member]
Class B Common Stock [Member]
Retained Earnings [Member]
Class B Common Stock [Member]
Paid-in Capital in Excess of Par Value [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Total
Balance at Sep. 24, 2016 $ 698,324     $ 314,665     $ 12,311,249   $ 456,851,372 $ 470,175,610
Balance (in shares) at Sep. 24, 2016 13,966,476     6,293,300            
Net income                 53,873,580 53,873,580
Cash dividends   $ (9,254,502) $ (9,254,502)   $ (3,742,685) $ (3,742,685)        
Common stock conversions $ 5,878     $ (5,878)            
Common stock conversions (in shares) 117,568     (117,568)            
Balance at Sep. 30, 2017 $ 704,202     $ 308,787     12,311,249   497,727,765 511,052,003
Balance (in shares) at Sep. 30, 2017 14,084,044     6,175,732            
Net income                 97,364,628 97,364,628
Cash dividends   (9,316,501) (9,316,501)   (3,686,322) (3,686,322)        
Common stock conversions $ 3,067     $ (3,067)            
Common stock conversions (in shares) 61,341     (61,341)            
Balance at Sep. 29, 2018 $ 707,269     $ 305,720     12,311,249   582,089,570 595,413,808
Balance (in shares) at Sep. 29, 2018 14,145,385     6,114,391            
Net income                 81,580,002 81,580,002
Other comprehensive (expense) income, net of income tax               $ (1,265,650)   (1,265,650)
Cash dividends   $ (9,346,549) $ (9,346,549)   $ (3,659,005) $ (3,659,005)        
Common stock conversions $ 1,755     $ (1,755)            
Common stock conversions (in shares) (35,100)     35,100            
Balance at Sep. 28, 2019 $ 709,024     $ 303,965     $ 12,311,249 $ (1,265,650) $ 650,664,019 $ 662,722,606
Balance (in shares) at Sep. 28, 2019 14,180,485     6,079,291