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Share-Based Compensation - Additional Information (Detail) - ASU for Compensation-Stock Compensation [Member] $ in Millions	Sep. 30, 2017 USD ($)
Retained Earnings [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	$ 24.7
Additional Paid-in Capital [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	1.0
Deferred Tax Assets for Research Credit and Alternative Minimum Tax Credit Carryforwards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net cumulative effect, change in amount	$ 25.7

X

- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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