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Japanese Yen Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2025 JPY (¥)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 JPY (¥)	Mar. 31, 2025 JPY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 JPY (¥)
Cash and Cash Equivalents [Abstract]
Proceeds from purchases of redeemable capital Shares	$ 151,202,890	¥ 22,602,368,568	$ 65,278,857	¥ 33,771,246,366
Principal redemptions	14,751,084	1,845,821,991	$ 15,712,161	16,182,775,633
Withdrawals (to pay expenses)		¥ 61,732,822		¥ 246,065,012
Deposits, interest bearing	$ 549,055,814				¥ 82,105,806,475	$ 390,754,598	¥ 61,410,992,720
Annual nominal rate	0.00%				0.00%

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Rate of interest on investment.

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