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Canadian Dollar Deposits - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2018 USD ($)	Oct. 31, 2018 CAD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CAD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 CAD ($)	Oct. 31, 2018 CAD ($)	Oct. 31, 2017 CAD ($)	Oct. 31, 2016 CAD ($)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 42,164,974	$ 54,255,052	$ 37,735,347	$ 49,380,475	$ 26,133,576	$ 34,684,482
Principal redemptions	57,493,667	73,984,431	64,137,640	83,929,646	41,053,575	54,486,305
Withdrawals (to pay expenses)		$ 4,301		$ 726,489		$ 1,085,107
Deposits, interest bearing	$ 157,743,039		$ 176,006,303		$ 195,609,315		$ 207,156,045	$ 226,889,725	$ 262,165,385
Annual nominal rate	1.23%	1.23%

X

- 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)
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- Definition

Total amount of cash paid for operating activities during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (d)-(g)
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- Definition

The cash outflow for reacquisition of callable preferred stock.

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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 15
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The cash inflow from issuance of preferred stock that is classified as callable.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 14
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