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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]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Total
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        
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         22,152,337 22,152,337
Other comprehensive income, net of income tax       $ 340,339   340,339
Cash dividends         (3,251,148) (3,251,148)
Balance at Dec. 29, 2018 $ 707,269 $ 305,720 $ 12,311,249 $ 340,339 $ 600,990,759 $ 614,655,336
Balance (in shares) at Dec. 29, 2018 14,145,385 6,114,391