Provision for Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2017 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Sep. 30, 2018 |
|
| Corporate tax rate | 29.80% | 35.00% | 36.00% | 15.20% | 37.20% | |
| Provisional discrete tax benefit | $ 3.5 | |||||
| Scenario, Plan [Member] | ||||||
| Corporate tax rate | 21.00% | |||||
| Income tax provision based on a blended U.S. statutory tax rate | 24.50% | |||||
| X | ||||||||||
- Definition Effective Income Tax Rate Reconciliation At Blended Federal Statutory Income Tax Rate No definition available.
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| X | ||||||||||
- Definition Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit). No definition available.
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| X | ||||||||||
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Details
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