CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 29,155	$ (10,320)	$ 134,830	$ 101,572
Other comprehensive income, net of tax
Unrealized gain on available for sale securities, net of tax of $(9), $(79), $(235) and $(104), respectively	13	114	340	150
Net unrealized (loss) on derivatives, net of tax of $13, $8, $23 and $49, respectively	(22)	(14)	(39)	(84)
Adjustment to postemployment benefit obligation, net of tax of $(203), $(149), $(608) and $(448), respectively	296	220	1,005	658
Other comprehensive income	287	320	1,306	724
Comprehensive income (loss)	$ 29,442	$ (10,000)	$ 136,136	$ 102,296