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Japanese Yen Deposits - Additional Information (Detail)	2 Months Ended	9 Months Ended
	Dec. 31, 2018 JPY (¥)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 JPY (¥)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 JPY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 JPY (¥)
Cash And Cash Equivalents [Abstract]
Principal deposits	¥ 4,776,165,855	$ 336,287,987	¥ 36,251,438,552	$ 104,908,031
Principal redemptions	0	283,381,686	31,474,259,335	$ 82,959,702
Withdrawals (to pay expenses)	¥ 12,310,233		¥ 91,396,066
Deposits, interest bearing		$ 220,130,958			¥ 23,790,653,298	$ 174,131,797	¥ 19,104,870,147
Annual nominal rate		(0.10%)			(0.10%)

X

- Definition

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.

+ References

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- Definition

Rate of interest on investment.

+ References

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- Definition

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

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- Definition

The cash outflow for reacquisition of callable preferred stock.

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

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