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Japanese Yen Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 JPY (¥)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 JPY (¥)	Sep. 30, 2021 JPY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 JPY (¥)
Cash And Cash Equivalents [Abstract]
Proceeds from purchases of redeemable capital Shares	$ 47,226,990	¥ 5,178,701,476	$ 223,565,910	¥ 24,652,512,877
Principal redemptions	78,429,814	8,487,484,406	$ 161,124,939	19,901,290,156
Withdrawals (to pay expenses)		¥ 98,189,851		¥ 153,028,653
Deposits, interest bearing	$ 198,073,902				¥ 22,100,095,676	$ 247,053,789	¥ 25,507,068,457
Annual nominal rate	(0.20%)				(0.20%)

X

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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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Total amount of cash paid for operating activities during the current period.

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The cash inflow from issuance of preferred stock that is classified as callable.

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