Japanese Yen Deposits - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Apr. 30, 2015 JPY (¥)	Oct. 31, 2014 JPY (¥)	Apr. 30, 2015 USD ($)		Oct. 31, 2014 USD ($)	Apr. 30, 2015 Redemptions Payable [Member] USD ($)	Oct. 31, 2014 Subscription Receivable [Member] USD ($)
Deposits [Line Items]
Annual nominal rate of interest on deposit			0.00%
Japanese Yen principal deposits	¥ 30,646,292,831	¥ 23,909,334,879
Japanese Yen principal redemptions	34,046,624,911	26,348,016,499
Japanese Yen withdrawals	23,616,224	53,958,569
Japanese Yen principal balance, ending	¥ 8,262,025,814	¥ 11,685,974,118	$ 89,338,860	[1]	$ 82,529,967	$ 69,040,075	$ 104,241,328

[1] (Unaudited)