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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Income tax (benefit) provision |  | $ (2,613,000) |  | $ 533,000 | $ (2,799,000) | $ 3,315,000 |
Discrete tax expense |  |  |  |  | $ 1,200,000 |  |
U.S. federal statutory tax rate | 21.00% | 24.50% |  | 35.00% | 24.50% | 35.00% |
Discrete tax benefit (expense) |  | $ 1,000,000 |  |  | $ 1,400,000 | $ (300,000) |
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate |  | 1,300,000 | $ 1,200,000 |  | 1,300,000 |  |
Undistributed earnings in foreign subsidiaries |  | $ 0 | $ 0 |  | $ 0 |  |
IRS [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Income tax examination, year under examination |  |  | 2016 |  |  |  |
Expected Statutory Income Tax Rate [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
U.S. federal statutory tax rate |  |  |  |  |  |  | 24.50%

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