Investments - Non-Current Investments (Details) - USD ($) $ in Thousands |
Mar. 31, 2021 |
Sep. 30, 2020 |
|---|---|---|
| Non-current investments [Abstract] | ||
| Equity and fixed income mutual funds | $ 25,455 | $ 24,610 |
| Life insurance policies | 4,626 | 4,621 |
| Other (primarily cost-method) investments | 18,967 | 34,019 |
| Total non-current investments | $ 49,048 | $ 63,250 |
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of investments classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|