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Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |
Balance at beginning of period | $ 38,407 | $ 25,673 | $ 23,112 | $ 38,407
Additions (reductions) to income tax |  | (5,947) | 2,561 | (5,555)
Write-offs |  | (2,277) | 0 | (9,740)
Balance at end of period |  | 17,449 | 25,673 | 23,112
Write-offs |  | 2,277 | $ 0 | $ 9,740
Deferred Tax Asset Related to ASC 606 Adoption |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |
Write-offs | (9,600) |  |  |
Write-offs | $ 9,600 |  |  |
Deferred Tax Asset Related to ASC 842 Adoption |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |
Write-offs |  | (2,300) |  |
Write-offs |  | $ 2,300 |  |

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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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