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Intangible Assets, Goodwill, Acquisitions, and Divestitures | 9 Months Ended
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Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Goodwill, Acquisitions, and Divestitures | 6. Intangible Assets, Goodwill, Acquisitions, and Divestitures Intangible Assets, net Identifiable intangible assets consist of acquired customer contracts and relationships. Amortization expense related to intangible assets was $7.1 and $8.6 for the three months ended June 30, 2025 and 2024, respectively. Amortization expense related to intangible assets was $22.3 and $27.4 for the nine months ended June 30, 2025 and 2024, respectively. These assets are amortized over their estimated useful lives of which the reasonableness is continually evaluated by the Company. There were no intangible assets acquired during the three and nine months ended June 30, 2025 and 2024, respectively. Intangible assets, net, as of June 30, 2025 and September 30, 2024 consisted of the following:
|  |  |  | June 30, 2025 |  |  | September 30, 2024 |
|  | Estimated Useful Life |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Customer relationships |  | 6-21 yrs. |  | $ | 715.9 |  |  | $ | (642.4 | ) |  | $ | 715.9 |  |  | $ | (620.1 | )
Total intangible assets |  |  |  | $ | 715.9 |  |  | $ | (642.4 | ) |  | $ | 715.9 |  |  | $ | (620.1 | )
Goodwill The following is a summary of the goodwill activity for the periods ended September 30, 2024 and June 30, 2025:
|  | Maintenance Services |  |  | Development Services |  |  | Total |
Balance, September 30, 2023 |  | $ | 1,803.4 |  |  | $ | 218.0 |  |  | $ | 2,021.4 |
Acquisitions (1) |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |
Divestiture |  |  | (5.8 | ) |  |  | — |  |  |  | (5.8 | )
Balance, September 30, 2024 |  | $ | 1,797.7 |  |  | $ | 218.0 |  |  | $ | 2,015.7 |
Balance, June 30, 2025 |  | $ | 1,797.7 |  |  | $ | 218.0 |  |  | $ | 2,015.7 |
(1) The acquisitions adjustment includes the immaterial impact of foreign currency adjustments during the period. Divestiture On January 12, 2024, the Company completed the sale of one of its fully owned subsidiaries, U.S. Lawns, for total cash consideration of $51.0. The gain on the transaction of $44.0 is included in Gain on divestiture in the Consolidated Statement of Operations for the nine months ended June 30, 2024. The Maintenance Services operating segment includes the operations of the divested entity, and its results of operations are included in the Consolidated Statement of Operations through January 12, 2024.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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