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Quarterly Financial Data - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Net discrete tax expense (benefits) | $ (1,500) | $ 100 | $ 200 | $ 2,800 | $ (200) | $ (700) | $ (100) | $ 1,500 | $ (1,000) | $ (1,500)
Restructuring charge | 100 | 200 |  |  |  | 2,500 |  | $ 504 | $ 2,515 | $ 753
Restructuring accrual, net of tax | $ 100 | $ 100 |  |  |  | $ 1,600 |  |  |  |

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