CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Net income	$ 114,809		$ 92,879		$ 101,299
Unrealized gain on available for sale securities, net of tax of $(330), $(270) and $(24), respectively (1)	479	[1]	391	[1]	38	[1]
Net unrealized (loss) gain on derivatives, net of tax of $23, $71 and $(84), respectively	(39)		(122)		146
Adjustment to postemployment benefit obligation, net of tax of $(5,934), $345 and $(567), respectively	8,710		(436)		1,219
Other comprehensive income (loss)	9,150		(167)		1,403
Comprehensive income	$ 123,959		$ 92,712		$ 102,702

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