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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
Retained Earnings
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       27,337,834 27,337,834
Cash dividends       (6,495,941) (6,495,941)
Common stock conversions $ 909 $ (909)      
Common stock conversions (in shares) 18,175 (18,175)      
Balance at Mar. 26, 2016 $ 697,142 $ 315,847 12,311,249 436,496,055 449,820,293
Balance (in shares) at Mar. 26, 2016 13,942,826 6,316,950      
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