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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 27, 2014	Sep. 27, 2013	Jun. 28, 2013
Property, plant and equipment, accumulated depreciation	$ 108,075us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ 103,314us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ 103,253us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Treasury stock, shares	11,203us-gaap_TreasuryStockShares	34,766us-gaap_TreasuryStockShares	35,680us-gaap_TreasuryStockShares
Class A [Member]
Common stock, shares issued	8,769,426us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,724,984us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,724,070us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Common stock, shares outstanding	8,769,426us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,724,984us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember	8,724,070us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassAMember
Class B [Member]
Common stock, shares issued	1,212,382us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,212,420us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,213,334us-gaap_CommonStockSharesIssued / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember
Common stock, shares outstanding	1,212,382us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,212,420us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember	1,213,334us-gaap_CommonStockSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_CommonClassBMember

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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