Income Taxes (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Changes in gross unrecognized tax benefits
Beginning balance	$ 13,635	$ 12,888	$ 10,687
Increase related to current year tax positions	1,260
Increases related to prior year tax positions	85	1,512	2,201
Decreases related to settlements with taxing authorities	(5,305)	(249)
Decreases related to lapsing of statute of limitations	(1,646)	(516)
Balance at the end of the period	$ 8,029	$ 13,635	$ 12,888

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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