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Income Taxes (Detail Textual) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Liability for unrecognized tax benefits | $ 4,200,000 |  |  | $ 4,100,000
Unrecognized tax benefit that would impact the company's effective tax rate | $ 4,200,000 |  |  |
Effective tax rate, percentage | 13.10% | 25.00% |  |
TCJA one-time transition tax, measurement period adjustment to income tax expense | $ 2,200,000 |  |  |
Statutory U.S. Income Tax Rate | 21.00% |  | 35.00% |
TCJA all other provisional amounts, measurement period adjustments to income tax expense | $ 0 |  |  |

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