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Subsequent Event (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 02, 2018 USD ($) ft² | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Oct. 31, 2018 USD ($) ft²
Subsequent Event [Line Items] |  |  |  |  |  |  |
Assets held for sale |  |  | $ 5,220 | $ 5,220 | $ 0 |  |
Tax benefit related to disposal |  |  | 1,100 |  |  |  |
Gain on sale of property, equipment and improvements |  |  |  | 622 | $ 0 | $ 0 |
Minimum lease obligations |  |  | $ 8,619 | $ 8,619 |  |  |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Term of lease |  |  |  |  |  |  | 13 years
Minimum lease obligations |  |  |  |  |  |  | $ 15,900
Area of lease (in sqft) | ft² |  |  |  |  |  |  | 59,497
Minnetonka, MN | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Area of real estate sold (in sqft) | ft² | 130,000 |  |  |  |  |  |
Proceeds from sale of building | $ 10,000 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Gain on sale of property, equipment and improvements |  | $ 4,500 |  |  |  |  |
Gain on sale of property, equipment and improvements, net of deferred taxes |  | $ 3,400 |  |  |  |  |

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