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Significant Accounting Policies - Additional Information (Detail) $ in Millions | Sep. 30, 2018 USD ($)
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ASU 2016-01 [Member] |
Schedule Of Significant Accounting Policies [Line Items] |
Reclassification from accumulated other comprehensive income to retained earnings | $ 3.6
ASU 2018-02 [Member] |
Schedule Of Significant Accounting Policies [Line Items] |
Reclassification from accumulated other comprehensive income to retained earnings | $ 0.6

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