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Japanese Yen Deposits - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Jan. 31, 2016
JPY (¥)
Jan. 31, 2015
USD ($)
Oct. 31, 2015
JPY (¥)
Jan. 31, 2016
JPY (¥)
Oct. 31, 2015
USD ($)
Oct. 31, 2015
JPY (¥)
Cash and Cash Equivalents [Abstract]              
Annual nominal rate 0.00% 0.00%          
Principal deposits $ 292,616,395 ¥ 35,374,161,940 $ 251,339,789 ¥ 47,636,264,433      
Principal redemptions 124,251,919 15,020,715,143 189,541,270 43,753,574,107      
Withdrawals (to pay expenses) 188,474 ¥ 22,784,524 $ 96,299 ¥ 48,247,219      
Deposits, interest bearing $ 296,130,835       ¥ 35,851,079,498 $ 128,613,360 ¥ 15,520,417,225