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DERIVATIVE INSTRUMENTS - INCOME STATEMENT RELATED DISCLOSURES (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ 1,305 | $ (42,925) | $ (9,084) | $ (90,457)
Interest rate contracts | Interest Expense | Home Services and Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (62) | 121 | (185) | 121
Energy Services | Physical commodity contracts | Operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 171 | (11,952) | (1,361) | (10,742)
Energy Services | Physical commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 3,306 | (44,646) | (2,126) | (67,343)
Energy Services | Financial commodity contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (2,231) | 13,767 | (5,187) | (12,230)
Energy Services | Foreign currency contracts | Gas purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 121 | (215) | (225) | (263)
Natural Gas Distribution |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 279 | 6,887 | 7,652 | (8,964)
Natural Gas Distribution | Physical commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | 1,436 | (12,879) | 4,413 | (15,855)
Natural Gas Distribution | Financial commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | (1,157) | 7,232 | 3,239 | (1,576)
Natural Gas Distribution | Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of (losses) gains recognized in income on derivatives | $ 0 | $ 12,534 | $ 0 | $ 8,467

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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