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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Income Taxes [Line Items]
Effective income tax rate	32.60%	29.80%	31.80%	26.80%
Unrecognized tax benefits, uncertain tax positions	$ 7.6		$ 7.6		$ 9.5
Unrecognized tax benefits, accrued interest	$ 0.3		$ 0.3		$ 0.8

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

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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