Provision for Income Taxes (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Sep. 30, 2018 |
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| Income Tax Disclosure [Abstract] | |||||
| Blended statutory tax rate, percent | 24.50% | ||||
| Income tax benefit related to tax act | $ 3.5 | ||||
| Effective tax rate, percent | 26.10% | 29.80% | 25.10% | 15.20% | |
| X | ||||||||||
- Definition Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit No definition available.
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| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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