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Basis of Presentation (Details) - segment |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2025 | Mar. 31, 2025 | Jun. 30, 2025 | Jul. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of reportable segments | 3 | 4 | 3 |
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 60.00% | 60.00%
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd | Hitachi Global Life Solutions, Inc. |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Ownership percentage |  |  | 40.00% | 40.00%

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