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Share-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended		1 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2011 Non-Employee Director Plan [Member]	Sep. 30, 2011 Employee Stock Plan [Member]	Sep. 30, 2011 Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 7,097		$ 2,972	$ 10,446	$ 5,474
Number of RSU unvested award, granted						61	735
RSUs vesting period in years		three
Shares granted subject to performance target								204
Weighted average fair value per share at date of grant, granted						$ 29.12	$ 23.48

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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- Definition

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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