Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024
Other Income (Expense) [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses						$ (40,000,000)
Investment income (loss)	$ 1,000,000		$ 4,000,000		$ 1,000,000	16,000,000
Other Income (Expense) [Member] | Revaluation of Non-functional Currency [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses					$ (2,000,000)	$ (40,000,000)
Other Income (Expense) [Member] | Revaluation of Non-functional Currency [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	$ (1,000,000)		(1,000,000)
Other Income (Expense) [Member] | Single Devaluation Action [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses				$ (33,000,000)
BOPREAL Bonds [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses		$ (2,000,000)
Purchase of bonds to settle foreign payables		$ 8,000,000	30,000,000
Investment income (loss)			(8,000,000)
Proceeds from sale of bonds			$ 22,000,000