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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. 28, 2013 $ 671,899us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 466,090us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 77,186,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 332,315,037us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 410,639,275us-gaap_StockholdersEquity
Balance (in shares) at Sep. 28, 2013 13,437,975us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,321,801us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net income       19,988,058us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
19,988,058us-gaap_NetIncomeLoss
Cash dividends       (7,231,123)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(7,231,123)us-gaap_DividendsCommonStockCash
Common stock conversions 1,528us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(1,528)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock conversions (in shares) 30,562us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(30,562)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Balance at Mar. 29, 2014 673,427us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
464,562us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
77,186,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
345,071,972us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
423,396,210us-gaap_StockholdersEquity
Balance (in shares) at Mar. 29, 2014 13,468,537us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,291,239us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Balance at Sep. 27, 2014 677,017us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
335,972us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
12,311,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
369,277,929us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
382,602,167us-gaap_StockholdersEquity
Balance (in shares) at Sep. 27, 2014 13,540,333us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,719,443us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net income       29,340,548us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
29,340,548us-gaap_NetIncomeLoss
Cash dividends       (6,485,341)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(6,485,341)us-gaap_DividendsCommonStockCash
Common stock conversions 10,987us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(10,987)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Common stock conversions (in shares) 219,750us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(219,750)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Balance at Mar. 28, 2015 $ 688,004us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 324,985us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 12,311,249us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 392,133,136us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 405,457,374us-gaap_StockholdersEquity
Balance (in shares) at Mar. 28, 2015 13,760,083us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,499,693us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember