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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Statement of Stockholders' Equity [Abstract]
Unrealized loss on cash flow hedges, tax		$ 94	$ 265
Postretirement benefit adjustment, tax	$ 20	$ 60	$ 58

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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