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Benefit Plans, Plan Assets (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Equities	Sep. 30, 2011 Corporate Bonds	Sep. 30, 2011 UK Government Bonds	Sep. 30, 2011 Cash	Sep. 30, 2011 Other Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 4,760	$ 4,771	$ 1,752	$ 977	$ 445	$ 26	$ 1,560
Actual Plan Asset Allocations	100.00%		36.00%	21.00%	9.00%	1.00%	33.00%
Fair Value Measurement Level			2	2	2	1	2

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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