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Condensed Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
Class A Common Stock [Member]
Common Stock [Member]
Class B Common Stock [Member]
Common Stock [Member]
Paid-in Capital in Excess of Par Value [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       13,823,887 13,823,887
Cash dividends       (3,248,464) (3,248,464)
Common stock conversions $ 4 $ (4)      
Common stock conversions (in shares) 75 (75)      
Balance at Dec. 24, 2016 $ 698,328 $ 314,661 12,311,249 467,426,795 480,751,033
Balance (in shares) at Dec. 24, 2016 13,966,551 6,293,225      
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       45,146,740 45,146,740
Cash dividends       (3,250,228) (3,250,228)
Common stock conversions $ 1,710 $ (1,710)      
Common stock conversions (in shares) 34,200 (34,200)      
Balance at Dec. 30, 2017 $ 705,912 $ 307,077 $ 12,311,249 $ 539,624,277 $ 552,948,515
Balance (in shares) at Dec. 30, 2017 14,118,244 6,141,532