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RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2025
Restructuring [Line Items] |  |  |  |  |
Expense | $ 21 | $ 30 | $ 32 | $ 113 |
Other restructuring costs | 6 | 3 | 8 | 7 |
AspenTech |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expense |  |  | 1 |  |
National Instruments |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expense |  | 10 |  | 36 |
Corporate and other |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expense | 2 | 11 | 3 | 37 |
Corporate and other | AspenTech |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expense | $ 1 |  | $ 1 |  |
Corporate and other | National Instruments |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expense |  | $ 11 |  | $ 37 |
Forecast |  |  |  |  |
Restructuring [Line Items] |  |  |  |  |
Expected fiscal year restructuring expense |  |  |  |  | $ 140

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