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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Schedule of assets and liabilities measured at fair value    
Equity method investment $ 39,677 $ 39,476
Recurring basis | Level 1    
Schedule of assets and liabilities measured at fair value    
Money market funds included in cash and cash equivalents 175,459 131,065
Current portion of due from related parties related to share based payment awards 2,804 6,076
Long term portion of due from related parties related to share based payment awards 15,167 14,331
Current portion of employer compensation liability related to share based payment awards 2,804 6,076
Long term portion of employer compensation liability related to share based payment awards 15,167 14,331
Recurring basis | Level 1 | SEVN    
Schedule of assets and liabilities measured at fair value    
Equity method investment 18,242 8,513
Recurring basis | Level 1 | TA    
Schedule of assets and liabilities measured at fair value    
Equity method investment $ 21,435 $ 30,963