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Intangible Assets
 12 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The table below summarizes the major classes of our intangible assets:
20252024
30 SeptemberGrossAccumulated
Amortization/
Impairment		NetGrossAccumulated
Amortization/
Impairment		Net
Finite-lived:
Customer relationships$532.3 ($318.5)$213.8 $524.9 ($298.2)$226.7 
Patents and technology31.1 (21.0)10.1 32.9 (20.7)12.2 
Other64.4 (29.9)34.5 69.3 (32.9)36.4 
Total finite-lived intangible assets$627.8 ($369.4)$258.4 $627.1 ($351.8)$275.3 
Indefinite-lived:
Trade names and trademarks44.6 (9.5)35.1 46.2 (9.9)36.3 
Total intangible assets$672.4 ($378.9)$293.5 $673.3 ($361.7)$311.6 
Amortization expense for intangible assets was $37.3, $31.5, and $32.5 in fiscal years 2025, 2024, and 2023, respectively. For details on the amortization periods applicable to each major class of intangible assets, refer to Note 1, Basis of Presentation and Major Accounting Policies.
The table below details the amount of amortization expense expected to be recorded for our finite-lived intangible assets in each of the next five years and thereafter:
2026$31.5 
202730.7 
202827.1 
202924.1 
203023.5 
Thereafter121.5 
Total$258.4 
Indefinite-lived intangible assets are subject to impairment testing at least annually or more frequently if events or changes in circumstances indicate that potential impairment exists. The impairment test for indefinite-lived intangible assets involves an optional assessment of qualitative factors to determine whether it is more likely than not that the fair value of the asset is less than its carrying value. If qualitative factors alone are not sufficient to support this conclusion, we perform quantitative testing that involves calculating the fair value of the indefinite-lived intangible asset. If the fair value of the asset is less than its carrying value, the difference is recorded as an impairment loss, not to exceed the total carrying value of the asset. During the fourth quarter of fiscal year 2025, we conducted our annual impairment test and concluded that it was more likely than not that the fair value of each indefinite-lived intangible asset was greater than its carrying value.