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Restructuring and Other Charges, Net - Additional Information (Detail) - IFF Productivity Program $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2025 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Additional Charges (Reversals), Net | $ 17 |
Employee Severance |  |
Restructuring Cost and Reserve [Line Items] |  |
Additional Charges (Reversals), Net | 17 |
Restructuring costs incurred |  | $ 20
Fixed Asset Write Down |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs incurred |  | 20
Minimum | Nourish, Health And Biosciences, And Scent |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs expected | 50 | 50
Maximum | Nourish, Health And Biosciences, And Scent |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring costs expected | $ 70 | $ 70

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