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Pension and Postretirement Benefits (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 27, 2020 | Sep. 29, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Date the Board of Directors freeze benefit accruals and future eligibility under the Qualified Pension Plan | Dec. 31, 2009 |  |  |
Termination of Qualified Pension Plan, description | The Board of Directors subsequently approved to proceed with the termination of the Qualified Pension Plan. During the quarter ended December 30, 2018, we completed a substantial portion of terminating the Qualified Pension Plan. In connection with the termination of the Qualified Pension Plan, distributions from the Qualified Pension Plan trust were made during the three month period ended December 30, 2018 to participants who elected lump-sum distributions. Additionally, during the three months ended December 30, 2018, we entered into an agreement with an insurance company to purchase from us, through a series of annuity contracts, our remaining obligations under the Qualified Pension Plan and, as a result, we settled the remaining obligations under the plan for the remaining participants utilizing funds available in the Qualified Pension Plan trust. |  |  |
Additional cash contributions to settle pension obligations | $ 0 |  |  |
Non-cash pre-tax settlement charge |  |  |  | $ 31,900,000
Non-cash compensation expense |  | $ 2,228,000 | $ 4,800,000 | $ 4,200,000
Rabbi Trust Assets - SERP | 2,900,000 |  | $ 2,900,000 |
Postretirement plan annual benefit limit for future eligible retirees | $ 4,000 |  |  |
Other postretirement benefits maximum benefit period | 5 years |  |  |
Supplemental Employee Retirement Plan, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of participant's base salary received as Supplemental Retirement Benefits | 8.00% |  |  |
Vesting period, SERP | 5 years |  |  |

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- Definition Annual benefit accrual percentage of a participants' base salary and cash bonus under the Supplement Executive Retirement Plan. + References No definition available. + Details
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- Definition Date the board of directors freeze benefit accruals and future eligibility under the qualified pension plan. + References No definition available. + Details
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- Definition Period in which an employee's right to receive a benefit under the Supplemental Employee Retirement Plan is no longer contingent on satisfaction of a service condition, in 'PnYnMnDTnHnMnS' format. + References No definition available. + Details
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- Definition Non-cash compensation expense related to the excess pension asset distribution resulting from the termination of our qualified pension plan. + References No definition available. + Details
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- Definition The maximum annual benefit amount available to each retiree for postretirement health benefits under the other postretirement defined benefit plan. + References No definition available. + Details
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- Definition The maximum benefit period, in years, available to each retiree for postretirement health benefits under the other postretirement defined benefit plan. + References No definition available. + Details
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- Definition Description of plan to terminate the qualified defined benefit pension plan. + References No definition available. + Details
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- Definition The total amount of cash and securities held by third party trustees in a rabbi trust for the payment of supplemental employee retirement benefits. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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