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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. 27, 2014 $ 677,017     $ 335,972     $ 12,311,249 $ 369,277,929 $ 382,602,167
Balance (in shares) at Sep. 27, 2014 13,540,333     6,719,443          
Net income               59,353,123 59,353,123
Cash dividends   $ (9,020,232) $ (9,020,232)   $ (3,956,658) $ (3,956,658)      
Common stock conversions $ 19,216     $ (19,216)          
Common stock conversions (in shares) 384,318     (384,318)          
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