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Japanese Yen Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 JPY (¥)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 JPY (¥)	Sep. 30, 2025 JPY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 JPY (¥)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 546,953,433	¥ 79,312,472,968	$ 208,308,648	¥ 33,771,246,366
Principal redemptions	409,510,530	59,887,146,280	$ 64,467,427	16,182,775,633
Withdrawals (to pay expenses)		¥ 274,901,460		¥ 246,065,012
Deposits, interest bearing	$ 545,494,925				¥ 80,561,417,948	$ 390,754,598	¥ 61,410,992,720
Annual nominal rate	0.00%				0.00%

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