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Japanese Yen Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 JPY (¥)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 JPY (¥)	Mar. 31, 2024 JPY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 JPY (¥)
Cash and Cash Equivalents [Abstract]
Proceeds from purchases of redeemable capital Shares	$ 65,278,857	¥ 10,190,196,394	$ 74,706,667	¥ 40,464,676,109
Principal redemptions	15,712,161	2,317,095,048	$ 38,567,749	20,936,241,082
Withdrawals (to pay expenses)		¥ 65,562,500		¥ 194,462,561
Deposits, interest bearing	$ 342,767,358				¥ 51,876,125,845	$ 312,587,509	¥ 44,068,586,999
Annual nominal rate	(0.20%)				(0.20%)

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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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