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Note 6 - Pension, Postretirement and Postemployment Defined Benefit Plans (Details Textual)	3 Months Ended
	Dec. 27, 2020 USD ($)	Mar. 16, 2020 USD ($)
Multiemployer Plans, Withdrawal Obligation	$ 12,310,000
Multiemployer Plans, Withdrawal Obligation, Period (Year)	20 years
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 400,000
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	2,790,000
Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	23,830,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment	$ 23,830,000
BHMG [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, Ending Balance		$ 43,503,000
BHMG [Member] | Postemployment Retirement Benefits [Member]
Defined Benefit Plan, Benefit Obligation, Ending Balance		$ 36,800,000
Defined Benefit Plan, Collective Bargaining Units		8
Defined Benefit Plan, Collective Bargaining Units, Capped Premiums		5

X

- Definition

The number of collective bargaining units under defined benefit plan.

+ References

No definition available.

+ Details

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X

- Definition

The number of collective bargaining units with capped premiums under the defined benefit plan.

+ References

No definition available.

+ Details

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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 actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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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
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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