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Leases - Additional Disclosure (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
extension_option
Mar. 31, 2015
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Operating Leased Assets [Line Items]          
Estimated minimum future rental payments     $ 229,221    
Estimated future minimum sublease payments     15,498    
Corporate Office Lease          
Operating Leased Assets [Line Items]          
Initial term of lease, in years 13 years        
Annual rent at lease inception $ 2,500        
Annual rent in the terminal year of lease $ 3,900        
Number of extension options | extension_option 2        
Renewable term of lease, in years 5 years        
Estimated minimum future rental payments     $ 38,100    
Estimated future minimum sublease payments       $ 12,200 $ 12,200
Initial leased premises surrendered     15.00%    
Regional Offices Sublease | Miami and Mexico City          
Operating Leased Assets [Line Items]          
Estimated future minimum sublease payments   $ 4,600      
Regional Offices Sublease | Miami          
Operating Leased Assets [Line Items]          
Sublease term   9 years      
Minimum          
Operating Leased Assets [Line Items]          
Initial term of lease, in years     3 years    
Renewable term of lease, in years     3 years    
Maximum          
Operating Leased Assets [Line Items]          
Initial term of lease, in years     10 years    
Renewable term of lease, in years     5 years