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Long-Term Debt, Net - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]    
Debt issuance costs, net $ (1,846) $ (1,474)
Total long-term debt, net of issuance costs 139,298 36,776
Less current portion of long-term debt 0 (5,000)
Long-term debt, less current portion 139,298 31,776
Secured Debt | Term loans to bank under the Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 0 35,000
Line of Credit | Revolving Lines of Credit under the 2017 Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 0 3,250
Line of Credit | Revolving Lines of Credit under the 2019 Senior Secured Credit Facility    
Debt Instrument [Line Items]    
Long-term debt $ 141,144 $ 0