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Share-Based Compensation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock Based Compensation Activity [Line Items]
Allocated share-based compensation expense	$ 36,835	$ 34,355
Unrecognized compensation expense for all non-vested share-based awards	$ 160,493
Weighted-average remaining life non-vested share-based awards	2 years 4 months 24 days

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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