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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |
Effective income tax rate | 4.30% | (5.10%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |
Income tax expense | $ 1.9 | $ 6.0
Component of Income Tax Benefit Expense, Impairments, Nonrecurring [Member] |  |
Income Taxes [Line Items] |  |
Income tax expense |  | $ 12.3

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