Fair Value Measurements (Narrative) (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Fair Value Measurements [Abstract] | |||
| Transfers to level 1 | $ 0 | $ 0 | $ 0 |
| Transfers to level 2 | 0 | 0 | 0 |
| Transfers to Level 3 | $ 0 | 0 | |
| Impairment of intangible assets | $ 14,100,000 | $ 14,100,000 | |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|