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Stockholders' Equity (Stock-based Compensation Expense Recognized) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Stock-Based Compensation
Employee stock-based compensation expense	$ 6,590	$ 6,686	$ 5,499

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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