Employee Benefit Plans (Schedule Of Fair Value, Investments, Entities that Calculate Net Asset Value (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
Sep. 28, 2019	Sep. 29, 2018
Defined Benefit Plan Disclosure
Total investments at fair value	$ 1,170,405
Unfunded Commitments	5,017
Limited Partnerships
Defined Benefit Plan Disclosure
Unfunded Commitments	$ 5,017
Limited Partnerships \| Minimum
Defined Benefit Plan Disclosure
Redemption Notice Period	10 days
Limited Partnerships \| Maximum
Defined Benefit Plan Disclosure
Redemption Notice Period	45 days
Hedge Funds
Defined Benefit Plan Disclosure
Unfunded Commitments	$ 0
Hedge Funds \| Maximum
Defined Benefit Plan Disclosure
Redemption Notice Period	60 days
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure
Total investments at fair value	$ 29,334	$ 36,066
Fair Value Measured at Net Asset Value Per Share \| Limited Partnerships
Defined Benefit Plan Disclosure
Total investments at fair value	29,334	35,931
Fair Value Measured at Net Asset Value Per Share \| Hedge Funds
Defined Benefit Plan Disclosure
Total investments at fair value	$ 0	$ 135

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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