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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       22,975,334 22,975,334
Cash dividends       (6,497,080) (6,497,080)
Common stock conversions $ 5,239 $ (5,239)      
Common stock conversions (in shares) 104,775 (104,775)      
Balance at Mar. 25, 2017 $ 703,563 $ 309,426 12,311,249 473,329,626 486,653,864
Balance (in shares) at Mar. 25, 2017 14,071,251 6,188,525      
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       54,441,527 54,441,527
Cash dividends       (6,500,969) (6,500,969)
Common stock conversions $ 2,100 $ (2,100)      
Common stock conversions (in shares) 42,000 (42,000)      
Balance at Mar. 31, 2018 $ 706,302 $ 306,687 $ 12,311,249 $ 545,668,323 $ 558,992,561
Balance (in shares) at Mar. 31, 2018 14,126,044 6,133,732