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Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
Class A Common Stock
Common Stock [Member]
Class A Common Stock
Retained Earnings
Class A Common Stock
Class B Common Stock
Common Stock [Member]
Class B Common Stock
Retained Earnings
Class B Common Stock
Paid-in Capital in Excess of Par Value
Retained Earnings
Total
Balance (in shares) at Sep. 29, 2012 12,953,635     11,306,141          
Balance at Sep. 29, 2012 $ 647,682     $ 565,307     $ 114,236,249 $ 341,964,231 $ 457,413,469
Net income               20,795,890 20,795,890
Cash dividends   $ (17,141,839) $ (17,141,839)   $ (13,303,245) $ (13,303,245)      
Common stock conversions $ 24,217     $ (24,217)          
Common stock conversions (in shares) 484,340     (484,340)          
Stock repurchases, at cost       $ (75,000)     (37,050,000)   (37,125,000)
Stock repurchases, at cost (in shares)       (1,500,000)          
Balance (in shares) at Sep. 28, 2013 13,437,975     9,321,801          
Balance at Sep. 28, 2013 $ 671,899     $ 466,090     77,186,249 332,315,037 410,639,275
Net income               51,426,454 51,426,454
Cash dividends   (8,894,632) (8,894,632)   (5,568,930) $ (5,568,930)      
Common stock conversions $ 5,118     $ (5,118)          
Common stock conversions (in shares) 102,358     (102,358)          
Stock repurchases, at cost       $ (125,000)     (64,875,000)   $ (65,000,000)
Stock repurchases, at cost (in shares)       (2,500,000)   (2,500,000)     (4,000,000)
Balance (in shares) at Sep. 27, 2014 13,540,333     6,719,443          
Balance at Sep. 27, 2014 $ 677,017     $ 335,972     12,311,249 369,277,929 $ 382,602,167
Net income               59,353,123 59,353,123
Cash dividends   $ (9,020,232) $ (9,020,232)   $ (3,956,658) $ (3,956,658)      
Common stock conversions $ 19,216     $ (19,216)          
Common stock conversions (in shares) 384,318     (384,318)          
Balance (in shares) at Sep. 26, 2015 13,924,651     6,335,125          
Balance at Sep. 26, 2015 $ 696,233     $ 316,756     $ 12,311,249 $ 415,654,162 $ 428,978,400