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CONSOLIDATED STATEMENTS OF INCOME CONSOLIDATED STATEMENTS OF INCOME (PARENTHETICALS) - Natural Gas Marketing Segment [Member] - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation		$ 0	$ 0
Discontinued Operation, Tax Effect of Discontinued Operation	$ 6,841	$ 3,731	$ 6,141

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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