CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 123,320	$ 7,693
Other comprehensive income, net of tax
Unrealized gain (loss) on available for sale securities, net of tax of $(455), and $214, respectively	659	(310)
Net unrealized (loss) on derivatives, net of tax of $18, and $20, respectively	(31)	(34)
Adjustment to postemployment benefit obligation, net of tax of $(169) and $(111), respectively	247	161
Other comprehensive income (loss)	875	(183)
Comprehensive income	$ 124,195	$ 7,510