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401(k) Benefit Plan (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
401(k) Benefit Plan
Amount contributed and recorded expense under the 401(k) Benefit Plan	$ 2,680,000	$ 2,382,000	$ 1,113,000

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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