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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Reconciliation of Unrecognized Tax Benefits |  |  |  |  |
Beginning balance |  | $ 6,530 | $ 3,091 | $ 6,530 | $ 6,058
Increase for tax positions taken during a prior period |  |  | 0 | 963 | 0
Increase for tax positions taken during the current period |  |  | 0 | 0 | 472
Decrease for tax positions as a result of the lapse of the statute of limitations | $ (3,300) | $ (1,600) | (1,656) | (4,402) | 0
Ending balance |  |  | $ 1,435 | $ 3,091 | $ 6,530

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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