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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 3 Months Ended
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Dec. 31, 2014 USD ($)
Accounting Policies [Abstract] |
Reclassification of noncurrent taxes payable to assets under noncurrent deferred income taxes | $ 15,000

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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