Significant Accounting Policies - Additional Information (Detail) - Other Income (Expense) [Member] - USD ($)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policies [Line Items]
Foreign exchange losses	$ (40,000,000)
Maximum [Member]
Significant Accounting Policies [Line Items]
Investment income (loss)	1,000,000	$ 12,000,000
Revaluation of Non-functional Currency [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	$ (2,000,000)	(40,000,000)
Single Devaluation Action [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses		$ (33,000,000)