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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) $ in Thousands	3 Months Ended
	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

Estimated one-time tax provision as a result of the Tax Cuts and Jobs Act enacted in 2017.

+ References

No definition available.

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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

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- Definition

The number of executives departed in connection with an executive management reorganization in January 2016.

+ References

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- Definition

One-time transition tax future minimum payments due related to Tax Cuts and Jobs Act enacted in 2017.

+ References

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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

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