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401(k) Benefit Plan (Detail) (USD $) | 12 Months Ended
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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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- Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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