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Sale of Building (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 02, 2018
USD ($)
ft²
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale     $ 0 $ 4,395
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 buildings $ 10,000      
Gain on sale   $ 4,400    
Gain on sale, net of deferred tax   $ 3,400