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Selected Quarterly Information (Unaudited) - Summary of Selected Quarterly Information (Unaudited) (Detail) - USD ($)		3 Months Ended																12 Months Ended
		Oct. 31, 2018		Jul. 31, 2018		Apr. 30, 2018		Jan. 31, 2018		Oct. 31, 2017		Jul. 31, 2017		Apr. 30, 2017		Jan. 31, 2017		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Income
Interest Income		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0	$ 0	$ 0
Total Income		0		0		0		0		0		0		0		0		0	0	0
Expenses
Sponsor's fee		(236,940)		(308,043)		(352,863)		(304,504)		(336,169)		(309,874)		(231,287)		(200,485)		(1,202,350)	(1,077,815)	(1,244,665)
Interest Expense on currency deposits		(241,733)		(315,380)		(358,409)		(319,702)		(339,439)		(320,533)		(234,179)		(206,795)		(1,235,224)	(1,100,946)	(1,004,441)
Total Expenses		(478,673)		(623,423)		(711,272)		(624,206)		(675,608)		(630,407)		(465,466)		(407,280)		(2,437,574)	(2,178,761)	(2,249,106)
Net Comprehensive Loss		$ (478,673)		$ (623,423)		$ (711,272)		$ (624,206)		$ (675,608)		$ (630,407)		$ (465,466)		$ (407,280)		$ (2,437,574)	$ (2,178,761)	$ (2,249,106)
Basic and Diluted Earnings per Share		$ (0.23)	[1]	$ (0.23)	[1]	$ (0.23)	[1]	$ (0.24)	[1]	$ (0.23)	[1]	$ (0.22)	[1]	$ (0.20)	[1]	$ (0.21)	[1]	$ (0.93)	$ (0.87)	$ (0.78)
Weighted-average Shares Outstanding		2,125,000		2,704,348		3,076,966		2,601,630		2,924,457		2,826,630		2,321,348		1,903,261		2,623,288	2,495,342	2,878,005
Cash Dividends per Share	[1]	$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0
[1] The amount shown for a share outstanding for quarterly statements may not correlate with year to date amounts due to timing of subscriptions and redemptions in relation to income earned or distributed.

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