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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 73,328	$ 60,903	$ 121,975	$ 184,223
Other comprehensive income, net of tax
Unrealized gain (loss) on available for sale securities, net of tax of $(3,154), $380, $(5,768) and $(75), respectively	4,500	(550)	8,201	109
Net unrealized gain on derivatives, net of tax of $(21), $(68), $(2) and $(50) respectively	38	118	5	87
Adjustment to postemployment benefit obligation, net of tax of $(175), $(168), $(349), and $(337) respectively	257	239	513	486
Other comprehensive income (loss)	4,795	(193)	8,719	682
Comprehensive income	$ 78,123	$ 60,710	$ 130,694	$ 184,905

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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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