CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2009
Net income	$ 101,299		$ 117,457		$ 27,242
Unrealized gain (loss) on available for sale securities, net of tax of $(24), $(1,066), $37, respectively	38	[1]	1,544	[1]	(52)	[1]
Net unrealized gain (loss) on derivatives, net of tax of $(84), $69 and $74, respectively	146		(97)		(105)
Adjustment to postemployment benefit obligation, net of tax of $(567), $1,464 and $4,856, respectively	1,219		(3,402)		(7,181)
Other comprehensive income (loss)	1,403		(1,955)		(7,338)
Comprehensive income	$ 102,702		$ 115,502		$ 19,904

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