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Acquisition - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2022 | Mar. 31, 2022 | Jun. 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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