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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       34,502,038 34,502,038
Cash dividends       (9,747,115) (9,747,115)
Common stock conversions $ 5,356 $ (5,356)      
Common stock conversions (in shares) 107,118 (107,118)      
Balance at Jun. 24, 2017 $ 703,680 $ 309,309 12,311,249 481,606,295 494,930,533
Balance (in shares) at Jun. 24, 2017 14,073,594 6,186,182      
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       78,925,185 78,925,185
Cash dividends       (9,751,826) (9,751,826)
Common stock conversions $ 2,563 $ (2,563)      
Common stock conversions (in shares) 51,250 (51,250)      
Balance at Jun. 30, 2018 $ 706,765 $ 306,224 $ 12,311,249 $ 566,901,124 $ 580,225,362
Balance (in shares) at Jun. 30, 2018 14,135,294 6,124,482