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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Sep. 26, 2021
Multiemployer Plans, Withdrawal Obligation		$ 12,310,000
Multiemployer Plans, Withdrawal Obligation, Period (Year)		20 years
Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	$ 1,027,000		$ 23,830,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	(6,507,000)		23,830,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	1,027,000		$ 23,830,000
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	1,027,000	$ (0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	1,027,000	(0)
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	$ 400,000
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 0

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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X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
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X

- Definition

Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.

+ References

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X

- Definition

Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

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X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

+ References

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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

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