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Income Taxes - Additional Information (Details) - USD ($) |  | 3 Months Ended
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Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Possible decrease in tax expense in next 12 months |  | $ 8,400,000 |
Taxes paid on cash distribution | $ 28,500,000 | $ 31,300,000 |
Effective income tax rate |  | 45.10% | 42.70%
Increase in income tax expense |  | $ 2,500,000 |
Income tax benefit from reorganization |  | 3,700,000 |
Effect of adoption of new accounting pronouncement |  | (1,100,000) |
Adjustment of deferred tax assets and liabilities | $ 19,000,000.0 | $ 0 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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