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Canadian Dollar Deposits - Additional Information (Detail)	2 Months Ended			12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 CAD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CAD ($)	Dec. 31, 2018 CAD ($)	Oct. 31, 2018 CAD ($)	Oct. 31, 2017 CAD ($)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 14,787,034	$ 39,458,295	$ 0	$ 42,164,974	$ 54,255,052	$ 37,735,347	$ 49,380,475
Principal redemptions	18,556,077	$ 24,661,434	11,595,613	57,493,667	73,984,431	64,137,640	83,929,646
Cash paid for Sponsor's fee	103,771		$ 118,226	669,222	$ 4,301	764,437	$ 726,489
Deposits, interest bearing	$ 162,507,619			$ 157,743,039		$ 176,006,303		$ 221,952,906	$ 207,156,045	$ 226,889,725
Annual nominal rate	0.67%	0.67%

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- Definition

Payments for sponsor's fee.

+ References

No definition available.

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- Definition

The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for reacquisition of callable preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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