Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Details)

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Commitments and Contingencies - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]      
Operating lease expense $ 11,200,000 $ 9,100,000  
Debt Instrument [Line Items]      
Due to related parties in 2019 9,007,000    
Due to related parties in 2020 6,192,000    
Affiliated Entity      
Debt Instrument [Line Items]      
Due to related parties in 2019 200,000    
Due to related parties in 2020 100,000    
Compass Revolving Credit Facility      
Debt Instrument [Line Items]      
Assumed debt     $ 30,000,000.0
Letters of credit outstanding $ 11,800,000 $ 8,700,000