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Note M - 401(k) Profit-sharing Plan (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Sep. 24, 2016 | Sep. 26, 2015 | Sep. 27, 2014
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 1,936,000 | $ 1,836,000 | $ 1,686,000

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration