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Note 9 - Other Retirement Plans (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018 | Dec. 27, 2020
Employee Benefits and Share-based Compensation | $ 4,141,000 | $ 3,849,000 | $ 4,430,000 |
Multiemployer Plans, Withdrawal Obligation | $ 11,473,000 | $ 7,359,000 |  |
Forecast [Member] | Buffalo Subsidiaries [Member] |  |  |  |
Multiemployer Plans, Withdrawal Obligation |  |  |  | $ 12,300,000
Minimum [Member] |  |  |  |
Multiemployer Plans, Withdrawal Obligation, Period (Year) | 20 years |  |  |

X
- Definition The period of time in which an obligation recognized by withdrawing from a pension or postretirement benefit plan will be paid. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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X
- Definition Amount of expense for employee benefit and equity-based compensation. + References No definition available. + Details
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X
- 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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X
- Details
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Namespace Prefix: |
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X
- Details
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Period Type: |

X
- Details
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