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Income Taxes (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	(2.70%)	92.80%	14.10%	16.70%
U.S. federal statutory income tax rate			35.00%
Release of the valuation allowance			$ (12.2)
Income taxes associated with uncertain tax position	$ 18.9		$ 18.9		$ 17.4

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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