Retirement Benefits - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Retirement Benefits [Abstract] | ||||
| Defined contribution plan expense | $ 4.1 | $ 3.6 | $ 12.5 | $ 10.9 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of cost for defined contribution plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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