CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Net income	$ 57,357		$ 24,509
Unrealized gain on available for sale securities, net of tax of $(600) and $(286), respectively	869	[1]	410	[1]
Net unrealized (loss) on derivatives, net of tax of $23 and $39, respectively	(40)		(69)
Adjustment to postemployment benefit obligation, net of tax of $(150) and $0, respectively	219		0
Other comprehensive income (loss)	1,048		341
Comprehensive income	$ 58,405		$ 24,850

[1] Available for sale securities are included in other noncurrent assets in the Unaudited Condensed Consolidated Balance Sheets.