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Note 7 - Pension, Postretirement and Postemployment Defined Benefit Plans (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 28, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 28, 2020 USD ($) | Jun. 30, 2019 USD ($) | Mar. 16, 2020 USD ($)
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | $ (478,000) | $ (109,000) | $ (408,000) | $ (329,000) |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | $ 0 |  |
BHMG [Member] | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Ending Balance |  |  |  |  | $ 43,503,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | 642,000 |  |  |  |
BHMG [Member] | Postemployment Retirement Benefits [Member] |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Ending Balance |  |  |  |  | $ 36,800,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total | $ 590,000 |  |  |  |
Defined Benefit Plan, Collective Bargaining Units |  |  |  |  | 8
Defined Benefit Plan, Collective Bargaining Units, Capped Premiums |  |  |  |  | 5
Defined Benefit Plan, Collective Bargaining Units, Uncapped Premiums |  |  |  |  | 3

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- Definition The number of collective bargaining units under defined benefit plan. + References No definition available. + Details
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- Definition The number of collective bargaining units with capped premiums under the defined benefit plan. + References No definition available. + Details
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- Definition The number of collective bargaining units with uncapped premiums under defined benefit plan. + References No definition available. + Details
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- 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 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) 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 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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