XML 91 R69.htm IDEA: XBRL DOCUMENT
v3.24.4

RETIREMENT PLANS - ASSET CATERGORY ALLOCATION (Details) | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Cash and cash equivalents |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 4.00% | 2.00%
Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 19.00% | 32.00%
Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 73.00% | 66.00%
Other investment |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Actual asset allocation | 4.00% | 0.00%
Minimum | Cash and cash equivalents |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 0.00% |
Minimum | Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 15.00% |
Minimum | Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 45.00% |
Minimum | Other investment |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 0.00% |
Maximum | Cash and cash equivalents |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 25.00% |
Maximum | Fixed income securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 40.00% |
Maximum | Equity securities |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 75.00% |
Maximum | Other investment |  |
Entity's year-end target allocation, by asset category, and the actual asset allocations |  |
Target allocation | 10.00% |

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAssetsTargetAllocationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=brn_OtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |