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Japanese Yen Deposits - Additional Information (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2023
JPY (¥)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
JPY (¥)
Sep. 30, 2023
JPY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
JPY (¥)
Cash and Cash Equivalents [Abstract]              
Proceeds from purchases of redeemable capital Shares $ 212,746,723 ¥ 28,866,244,558 $ 139,917,652 ¥ 21,053,881,528      
Principal redemptions 149,619,744 20,936,241,082 $ 83,604,835 15,902,847,088      
Withdrawals (to pay expenses)   ¥ 143,972,897   ¥ 136,111,791      
Deposits, interest bearing $ 217,930,274       ¥ 32,520,645,112 $ 187,461,552 ¥ 24,734,614,533
Annual nominal rate (0.20%)       (0.20%)