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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 184,223us-gaap_NetIncomeLoss | $ 180,664us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash flows from operating activities: |  |
Unrealized (gain) loss on derivative instruments | (20,198)us-gaap_UnrealizedGainLossOnDerivatives | 52,394us-gaap_UnrealizedGainLossOnDerivatives
Depreciation and amortization | 29,590us-gaap_DepreciationDepletionAndAmortization | 25,394us-gaap_DepreciationDepletionAndAmortization
Allowance for equity used during construction | (2,014)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction | (603)us-gaap_IncreaseDecreaseInAllowanceForEquityFundsUsedDuringConstruction
Allowance for bad debt expense | 1,696us-gaap_ProvisionForDoubtfulAccounts | 1,205us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes | 31,576us-gaap_DeferredIncomeTaxExpenseBenefit | 22,970us-gaap_DeferredIncomeTaxExpenseBenefit
Manufactured gas plant remediation costs | (2,089)us-gaap_PaymentsForEnvironmentalLiabilities | (1,845)us-gaap_PaymentsForEnvironmentalLiabilities
Equity in earnings of equity investees, net of distributions received | 4,089us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | 1,626us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Cost of removal - asset retirement obligations | (403)us-gaap_AssetRetirementObligationCashPaidToSettle | (164)us-gaap_AssetRetirementObligationCashPaidToSettle
Contributions to postemployment benefit plans | (2,434)us-gaap_PensionAndOtherPostretirementBenefitContributions | (2,348)us-gaap_PensionAndOtherPostretirementBenefitContributions
Changes in: |  |
Components of working capital | 42,506us-gaap_IncreaseDecreaseInOperatingCapital | 96,040us-gaap_IncreaseDecreaseInOperatingCapital
Other noncurrent assets | 39,396us-gaap_IncreaseDecreaseInOtherNoncurrentAssets | 6,038us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Other noncurrent liabilities | 20,568us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities | 2,071us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Cash flows from operating activities | 326,506us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 383,442us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS (USED IN) INVESTING ACTIVITIES |  |
Utility plant expenditures | (58,657)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (59,971)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Solar and wind equipment expenditures | (88,370)us-gaap_PaymentsToAcquireOtherProductiveAssets | (45,403)us-gaap_PaymentsToAcquireOtherProductiveAssets
Real estate properties and other expenditures | (61)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment | (477)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
Cost of removal expenditures | (11,334)us-gaap_PaymentsForProceedsFromRemovalCosts | (10,914)us-gaap_PaymentsForProceedsFromRemovalCosts
Investments in equity investees | (1,264)us-gaap_PaymentsToAcquireEquityMethodInvestments | 0us-gaap_PaymentsToAcquireEquityMethodInvestments
Distribution from equity investees in excess of equity in earnings | 957us-gaap_EquityMethodInvestmentDividendsOrDistributions | 464us-gaap_EquityMethodInvestmentDividendsOrDistributions
Proceeds from sale of asset | 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 6,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
(Payment to) withdrawal from restricted cash construction fund | (1,484)us-gaap_IncreaseDecreaseInRestrictedCash | 85us-gaap_IncreaseDecreaseInRestrictedCash
Cash flows (used in) investing activities | (160,213)us-gaap_NetCashProvidedByUsedInInvestingActivities | (110,216)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS (USED IN) FINANCING ACTIVITIES |  |
Proceeds from issuance of common stock | 28,310us-gaap_ProceedsFromIssuanceOfCommonStock | 7,757us-gaap_ProceedsFromIssuanceOfCommonStock
Tax benefit from stock options exercised | 839us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 94us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from sale-leaseback transaction | 7,216us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities | 7,576us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities
Proceeds from long-term debt | 100,000us-gaap_ProceedsFromIssuanceOfLongTermDebt | 125,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments of long-term debt | (4,510)us-gaap_RepaymentsOfLongTermDebt | (65,017)us-gaap_RepaymentsOfLongTermDebt
Purchases of treasury stock | (3,945)us-gaap_PaymentsForRepurchaseOfCommonStock | (4,387)us-gaap_PaymentsForRepurchaseOfCommonStock
Payments of common stock dividends | (38,010)us-gaap_PaymentsOfDividendsCommonStock | (35,264)us-gaap_PaymentsOfDividendsCommonStock
Net payments of short-term debt | (155,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt | (302,400)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Cash flows (used in) financing activities | (65,100)us-gaap_NetCashProvidedByUsedInFinancingActivities | (266,641)us-gaap_NetCashProvidedByUsedInFinancingActivities
Change in cash and cash equivalents | 101,193us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 6,585us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 2,151us-gaap_CashAndCashEquivalentsAtCarryingValue | 2,969us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 103,344us-gaap_CashAndCashEquivalentsAtCarryingValue | 9,554us-gaap_CashAndCashEquivalentsAtCarryingValue
CHANGES IN COMPONENTS OF WORKING CAPITAL |  |
Receivables | (178,647)us-gaap_IncreaseDecreaseInAccountsReceivable | (294,939)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 205,992us-gaap_IncreaseDecreaseInInventories | 178,955us-gaap_IncreaseDecreaseInInventories
Recovery of gas costs | 15,734us-gaap_IncreaseDecreaseInRecoverableRefundableGasCosts | 6,866us-gaap_IncreaseDecreaseInRecoverableRefundableGasCosts
Gas purchases payable | 24,827njr_IncreaseDecreaseInGasPurchasesPayable | 137,947njr_IncreaseDecreaseInGasPurchasesPayable
Gas purchases payable - related parties | 155us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent | 97us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent
Prepaid and accrued taxes | 39,169njr_IncreaseDecreaseInPrepaidAndAccruedTaxes | 67,164njr_IncreaseDecreaseInPrepaidAndAccruedTaxes
Accounts payable and other | (35,456)us-gaap_IncreaseDecreaseInAccountsPayable | 3,992us-gaap_IncreaseDecreaseInAccountsPayable
Restricted broker margin accounts | (16,707)us-gaap_IncreaseDecreaseInPayablesToBrokerDealers | (21,329)us-gaap_IncreaseDecreaseInPayablesToBrokerDealers
Customers' credit balances and deposits | (5,821)us-gaap_IncreaseDecreaseInCustomerDeposits | (8,819)us-gaap_IncreaseDecreaseInCustomerDeposits
Other current assets | (6,740)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 26,106us-gaap_IncreaseDecreaseInOtherOperatingAssets
Components of working capital | 42,506us-gaap_IncreaseDecreaseInOperatingCapital | 96,040us-gaap_IncreaseDecreaseInOperatingCapital
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION |  |
Cash paid for Interest (net of amounts capitalized) | 12,946us-gaap_InterestPaidNet | 11,221us-gaap_InterestPaidNet
Cash paid for Income taxes | 14,719us-gaap_IncomeTaxesPaid | 8,648us-gaap_IncomeTaxesPaid
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING ACTIVITIES |  |
Accrued capital expenditures | $ 26,781us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 1,347us-gaap_CapitalExpendituresIncurredButNotYetPaid

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- Definition The increase (decrease) during the reporting period in the aggregate amount of obligations incurred arising from transactions with broker-dealers, such as amounts due on margin and unsettled cash transactions; includes payables to brokers, dealers and clearing organizations. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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