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Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Other Expenses [Abstract] |  |  |
Non-income taxes | $ 13.5 | $ 14.8 | $ 6.6
Insurance | 10.8 | 7.1 | 4.7
Employee related expenses | 9.6 | 7.0 | 4.7
Other direct business expenses | 10.0 | 6.3 | 4.6
Membership fees | 3.3 | 2.8 | 2.4
Director and public company expenses | 1.8 | 1.5 | 1.4
Office expenses | 1.7 | 1.3 | 1.8
Other expenses | 9.9 | 5.5 | 3.4
Total other expenses | $ 60.6 | $ 46.3 | $ 29.6

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- Definition Employee Related Expenses + References No definition available. + Details
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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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