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Sale of Building (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 02, 2018 USD ($) ft² | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale |  |  | $ 0 | $ 4,392 | $ 622
Minnetonka, MN |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Area of real estate sold (in sqft) | ft² | 130,000 |  |  |  |
Proceeds from sale of building | $ 10,000 |  |  |  |
Gain on sale |  | $ 4,400 |  |  |
Gain on sale, net of deferred tax |  | $ 3,400 |  |  |
Leasehold Improvements | Hopkins, MN |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Payments for leasehold improvements |  |  |  | $ 5,800 |
Useful life |  |  | 10 years |  |

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