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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 28, 2022 | Sep. 30, 2022
Business Acquisition [Line Items] |  |
Businesses acquisition, net of cash acquired |  | $ 9
Gain on bargain purchase of a business |  | 24
Tokai Carbon Group Tianjin Co |  |
Business Acquisition [Line Items] |  |
Business acquisition, purchase price | $ 9 |
Business acquisition, cash consideration | 14 |
Businesses acquisition, net of cash acquired | $ 5 |
Tokai Carbon Group Tianjin Co | Accounts Payable and Accrued Liabilities [Member] |  |
Business Acquisition [Line Items] |  |
Gain on bargain purchase of a business |  | $ 24
Tokai Carbon Group Tianjin Co | Tokai Carbon's Registered Capital [Member] |  |
Business Acquisition [Line Items] |  |
Business acquisition, ownership percentage | 100.00% |

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