Annual report pursuant to Section 13 and 15(d)

Property and equipment - Schedule of Property and Equipment, at cost (Details)

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Property and equipment - Schedule of Property and Equipment, at cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Property and equipment, at cost      
Property and equipment, gross $ 274,208 $ 327,709  
Less: Accumulated depreciation and amortization (172,557) (196,140)  
Total property and equipment, net 101,651 131,569  
Fixed asset depreciation expense 45,200 49,200 $ 37,000
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 11,799 11,726  
Office furniture and equipment      
Property and equipment, at cost      
Property and equipment, gross 207,140 261,752  
Leasehold improvements      
Property and equipment, at cost      
Property and equipment, gross $ 53,531 $ 52,493