Revenue - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Sep. 30, 2024 |
|
Cellulosics [Member] | Product Concentration Risk [Member] | Sales Revenue [Member] | |||||
Revenue From Contracts With Customers [Line Items] | |||||
Concentration risk percentage | 40.00% | 36.00% | 39.00% | 37.00% | |
Polyvinylpyrrolidones (PVP) [Member] | Product Concentration Risk [Member] | Sales Revenue [Member] | |||||
Revenue From Contracts With Customers [Line Items] | |||||
Concentration risk percentage | 25.00% | 21.00% | 25.00% | 22.00% | |
Trade Receivable [Member] | |||||
Revenue From Contracts With Customers [Line Items] | |||||
Trade receivables | $ 158 | $ 158 | $ 206 |