Annual report pursuant to Section 13 and 15(d)

Business segments - Schedule of Long-Lived Assets by Geographical Areas (Details)

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Business segments - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 156,947 $ 185,015
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 101,530 118,751
Australia    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 32,165 38,852
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 13,670 16,209
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets 9,251 11,086
Rest of World    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total long-lived assets $ 331 $ 117