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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) $ in Thousands | 3 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Executive
Quarterly Financial Information Disclosure [Abstract] |  |
Estimated one-time tax provision | $ 44,000 |
Transition tax | 40,250 |
Tax provision charge related to re-measurement of net deferred tax assets | $ 3,700 |
Number of executives departed in connection with an executive management reorganization in January 2016 | Executive |  | 2
Increase in net income as a result of reversal of accrual for potential future payments in connection with an executive management reorganization in January 2016 |  | $ 3,400

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- Definition Increase in net income as a result of reversal of accrual for potential future payments in connection with an executive management reorganization in January 2016. + References No definition available. + Details
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- Definition The number of executives departed in connection with an executive management reorganization in January 2016. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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