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Summary of Weighted-Average Grant-Date Fair Value and Intrinsic Value of Restricted Units Vested (Detail) (USD $) In Millions, except Per Share data	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value per share	$ 17.91	$ 15.59
Total intrinsic value of shares vested (in millions)	$ 81.8	$ 65.2

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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