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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]
Retained Earnings [Member]
Total
Balance at Sep. 26, 2015 $ 696,233     $ 316,756     $ 12,311,249 $ 415,654,162 $ 428,978,400
Balance (in shares) at Sep. 26, 2015 13,924,651     6,335,125          
Net income               54,189,466 54,189,466
Cash dividends   $ (9,200,271) $ (9,200,271)   $ (3,791,985) $ (3,791,985)      
Common stock conversions $ 2,091     $ (2,091)          
Common stock conversions (in shares) 41,825     (41,825)          
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