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Fair Value of Financial Instruments (Details) - Recurring basis - Level 1 - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds included in cash and cash equivalents | $ 341,612 | $ 357,526
Current portion of due from related parties related to share based payment awards | 4,298 | 4,814
Long term portion of due from related parties related to share based payment awards | 7,764 | 9,238
Current portion of employer compensation liability related to share based payment awards | 4,298 | 4,814
Long term portion of employer compensation liability related to share based payment awards | $ 7,764 | $ 9,238

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- Definition Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities which is included in cash and cash equivalents + References No definition available. + Details
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