Annual report pursuant to Section 13 and 15(d)

Balance sheet components - Schedule of Property and Equipment, at cost (Details)

v3.20.2
Balance sheet components - Schedule of Property and Equipment, at cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Property and equipment, at cost      
Property and equipment, gross $ 336,704 $ 329,636  
Less: Accumulated depreciation and amortization (269,983) (230,047)  
Total property and equipment, net 66,721 99,589  
Fixed asset depreciation expense 54,900 45,200 $ 40,700
Land      
Property and equipment, at cost      
Property and equipment, gross 1,738 1,738  
Building and improvements      
Property and equipment, at cost      
Property and equipment, gross 11,846 12,044  
Office furniture and equipment      
Property and equipment, at cost      
Property and equipment, gross 239,057 246,671  
Leasehold improvements      
Property and equipment, at cost      
Property and equipment, gross $ 84,063 $ 69,183