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Pensions And Other Postretirement Benefits (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2018 USD ($) plan | Apr. 01, 2017 plan | Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($) plan | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined contribution retirement programs, expenses recognized |  |  |  |  | $ 97,000 | $ 84,000 | $ 78,000
Retail, Wholesale and Department Store International Union and Industry Pension Fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer Plans, Withdrawal Obligation |  |  |  |  | 15,000 |  |
Multiemployer Plans, Pension [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer plan, contributions |  |  |  |  | 2,000 |  |
Multiemployer Plans, Pension [Member] | Retail, Wholesale and Department Store International Union and Industry Pension Fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer plan, contributions | [1] |  |  |  | $ 500 |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date | [2] |  |  |  | Nov. 07, 2021 |  |
Multiemployer Plans, Pension [Member] | Bakery and Confectionary Union & Industry International Pension Fund [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer plan, contributions |  |  |  |  | $ 1,000 | $ 2,000 | $ 2,000
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date | [2] |  |  |  | Oct. 10, 2015 |  |
Multiemployer Plans, Pension [Member] | Bakery and Confectionary Union & Industry International Pension Fund [Member] | Pension and Other Postretirement Plans, Contributions, Total [Member] | Multiemployer Plans Not In Excess of 5% Concentration Risk [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Concentration, Percentage |  |  |  |  |  |  | 5.00%
Multiemployer Plans, Pension [Member] | Pension Fund of Local 227 [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Multiemployer plan, contributions | [3] |  |  |  | $ 200 |  |
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date | [2] |  |  |  | Nov. 09, 2019 |  |
Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 9 |  |
Number of defined benefit plans with accumulated benefit obligations in excess of plan assets |  |  |  |  | 5 | 5 |
Expected contributions to pension plans for fiscal 2019 |  |  |  |  | $ 33,000 |  |
Defined benefit plans funding |  |  |  |  | $ 13,000 | $ 29,000 | $ 53,000
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 8 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 77,000 | 28,000 | 33,000
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 0 | 0 | 0
Defined benefit plans funding |  |  |  |  | $ 4,000 | 2,000 |
Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 5 |  |
Foreign Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of defined benefit plans | plan |  |  |  |  | 1 |  |
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | $ 31,000 |  |
Unfunded Plan [Member] | Nonqualified Plan [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 4 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 239,000 | 220,000 | 230,000
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 0 | 0 | 0
Defined benefit plans funding |  |  |  |  | $ 12,000 | 15,000 |
Funded Plan [Member] | Qualified Plan [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 5 |  |
Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits |  | $ 19,000 |  |  |  |  |
Accumulated benefit obligation |  |  |  |  | $ 1,478,000 | 1,392,000 |
Amounts expected to be reclassified to earnings within next 12 months related to net periodic benefit cost (credit) |  |  |  |  | 0 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | 1,478,000 | 1,392,000 | 1,477,000
Number of defined benefit plans | plan |  | 3 | 2 |  |  |  |
Defined Benefit Pension, Fair Value of Plan Assets |  |  |  |  | 1,477,000 | 1,450,000 | $ 1,512,000
Defined benefit plans funding |  |  |  |  | $ 1,000 | $ 14,000 |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 2 |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 17,000 |  |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance [Member] | Postretirement Life Insurance [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plan, Plan Amendments [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Plans | plan |  |  |  |  | 1 |  |
Other Postretirement Benefit Plan, Plan Amendments [Member] | Maximum [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 1,000 |  |
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Hillshire Plan [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 11,000 |  |
Healthcare cost trend rate, assumed |  |  |  |  | 7.30% |  |
Healthcare cost trend rate, ultimate rate |  |  |  |  | 4.50% |  |
Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Keystone Plan [Member] | Postretirement Health Coverage [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation |  |  |  |  | $ 9,000 |  |
Healthcare cost trend rate, assumed |  |  |  |  | 7.00% |  |
Healthcare cost trend rate, ultimate rate |  |  |  |  | 5.00% |  |
Subsequent Event [Member] | Funded Plan [Member] | Qualified Plan [Member] | Minimum [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits |  |  |  | $ 40,000 |  |  |
Defined benefit plans funding |  |  |  | 10,000 |  |  |
Subsequent Event [Member] | Funded Plan [Member] | Qualified Plan [Member] | Maximum [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Gain from Providing Special and Contractual Termination Benefits |  |  |  | 60,000 |  |  |
Defined benefit plans funding |  |  |  | $ 30,000 |  |  |
Fair Value, Inputs, Level 1 [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 36.00% |  |
Fair Value, Inputs, Level 2 [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 61.00% |  |
Fixed Income Funds [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 73.00% |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage |  |  |  |  | 100.00% |  |
Cash and Cash Equivalents [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  | 27.00% |  |
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage |  |  |  |  |  | 97.00% |
[1] | Contributions in fiscal 2019 exceeded 5% of plan contributions for the plan year ended December 31, 2018.
[2] | Renewal negotiations for the Bakery and Confectionery Union and Industry International Pension Fund are in progress.
[3] | Contributions in fiscal 2019 exceeded 5% of plan contributions for the plan year ended October 31, 2018.

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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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