Fair Value Measurements (Notes)	6 Months Ended
Fair Value Measurements (Notes)	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Fair value measurements	FAIR VALUE MEASUREMENTS The Company’s financial assets and liabilities include cash and cash equivalents, receivables and accounts payable for which the carrying value approximates fair value due to their short maturities (less than 12 months). The Company does not record its long-term debt at fair value on the Condensed Consolidated Balance Sheets. The fair value of outstanding borrowings under the Revolving Credit Facility (as defined in Note 11) as of September 30, 2023 approximated its carrying value. Based on market rates, the fair value (Level 2) of the Company’s debt, excluding any borrowings under the Revolving Credit Facility, was $866.6 and $830.0 as of March 31, 2024 and September 30, 2023, respectively. Certain assets and liabilities, including property, goodwill and other intangible assets, are measured at fair value on a non-recurring basis using Level 3 inputs.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.