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Share-Based Compensation - Additional Information (Detail) - ASU for Compensation-Stock Compensation [Member] $ in Millions | Sep. 30, 2017 USD ($)
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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

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