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Related Party Transactions	12 Months Ended
Related Party Transactions	Sep. 30, 2019
Related Party Transactions [Abstract]
Related-party transactions	Related‑Party Transactions Transactions with Investors Prior to the IPO, the Company paid an advisory fee of $333 per quarter to AEA Investors LP (“AEA”), the private equity firm and ultimate majority shareholder. In addition, the Company reimburses AEA for normal and customary expenses incurred by AEA on behalf of the Company. The Company incurred expenses, excluding advisory fees, of $20, $328 and $288 for the years ended September 30, 2019, 2018 and 2017, respectively. The Company owed no amounts to AEA at September 30, 2019 and 2018, respectively. Transactions with Customers and Employees The Company also has a related party relationship with one of their customers, who is also a shareholder of the Company. The Company had sales to this customer of $2,476, $3,603 and $3,917, respectively, for the years ended September 30, 2019, 2018 and 2017 and was owed $518 and $3,139 from them at September 30, 2019 and 2018, respectively.