Annual report pursuant to Section 13 and 15(d)

Balance Sheet Components - Schedule of Property and Equipment, at cost (Details)

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Balance Sheet Components - Schedule of Property and Equipment, at cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Property and equipment, at cost      
Property and equipment, gross $ 273,212 $ 274,208  
Less: Accumulated depreciation and amortization (195,668) (172,557)  
Total property and equipment, net 77,544 101,651  
Fixed asset depreciation expense 40,700 45,200 $ 49,200
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 12,044 11,799  
Office furniture and equipment      
Property and equipment, at cost      
Property and equipment, gross 203,512 207,140  
Leasehold improvements      
Property and equipment, at cost      
Property and equipment, gross $ 55,918 $ 53,531