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Organization and Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Oct. 01, 2018 | Sep. 30, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 705,824 | $ 666,210 | $ 633,281
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 33,927 | $ 32,929 |

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