XML 138 R113.htm IDEA: XBRL DOCUMENT
v3.8.0.1

BUSINESS SEGMENT AND OTHER OPERATIONS DATA - NET FINANCIAL EARNINGS LOSS RECONCILIATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Consolidated net financial earnings |  |  |  |  |  |  |  |  | $ 149,392 | $ 138,085 | $ 151,503
Less: |  |  |  |  |  |  |  |  |  |  |
Unrealized (gain) loss on derivative instruments and related transactions |  |  |  |  |  |  |  |  | (11,241) | 46,883 | (38,681)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Tax |  |  |  |  |  |  |  |  | 4,062 | (17,018) | 14,391
Effects of economic hedging related to natural gas inventory |  |  |  |  |  |  |  |  | 38,470 | (36,816) | (8,225)
Tax effect |  |  |  |  |  |  |  |  | (13,964) | 13,364 | 3,058
NET INCOME | $ (36,523) | $ 18,957 | $ 114,702 | $ 34,929 | $ 25,400 | $ (17,363) | $ 73,354 | $ 50,281 | $ 132,065 | $ 131,672 | $ 180,960

X
- Definition Effects of Economic Hedging Related to Natural Gas Inventory, Tax + References No definition available. + Details
Name: | njr_EffectsofEconomicHedgingRelatedtoNaturalGasInventoryTax
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase (Decrease) in Economic Hedging Related to Natural Gas Inventory, Before Taxes + References No definition available. + Details
Name: | njr_IncreaseDecreaseinEconomicHedgingRelatedtoNaturalGasInventoryBeforeTaxes
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Financial Earnings (Loss) is a non-GAAP measure of earnings that eliminates certain timing differences surrounding the recognition of certain gains or losses associated with derivative activity + References No definition available. + Details
Name: | njr_NetFinancialEarningsLoss
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net Financial Earnings (Loss), Reconciling Items [Abstract] + References No definition available. + Details
Name: | njr_NetFinancialEarningsLossReconcilingItemsAbstract
Namespace Prefix: | njr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrealized Gain (Loss) on Derivatives and Commodity Contracts, Tax + References No definition available. + Details
Name: | njr_UnrealizedGainLossonDerivativesandCommodityContractsTax
Namespace Prefix: | njr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration