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Share-Based Compensation - 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
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Allocated share-based compensation expense	$ 21,428	$ 19,271	$ 58,263	$ 53,626
Unrecognized compensation expense for all non-vested share-based awards	$ 141,387		$ 141,387
Weighted-average remaining life non-vested share-based awards	2 years 2 months 12 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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