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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (7,460)	$ (14,274)	$ 176,763	$ 166,390
Other comprehensive income, net of tax
Unrealized (loss) gain on available for sale securities, net of tax of $394, $(353), $319 and $(150), respectively	(570)	511	(461)	216
Net unrealized gain (loss) on derivatives, net of tax of $(6), $(95), $(56) and $14, respectively	6	162	93	(24)
Adjustment to postemployment benefit obligation, net of tax of $(169), $(111), $(506) and $(334), respectively	246	161	732	483
Other comprehensive (loss) income	(318)	834	364	675
Comprehensive (loss) income	$ (7,778)	$ (13,440)	$ 177,127	$ 167,065

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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