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Accumulated Other Comprehensive Income - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Equity [Abstract]
Taxes associated with reclassification adjustments for amortization of prior service credit and amortization of net actuarial losses	$ 7,506	$ 5,416	$ 15,011	$ 12,017
Income tax provision (benefit) for cash flow hedges	64		1,437	531
Tax benefit associated with reclassification adjustments	$ 952	$ 799	$ 1,772	$ 1,380

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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