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Canadian Dollar Deposits - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CAD	Oct. 31, 2016 USD ($)	Oct. 31, 2016 CAD	Oct. 31, 2015 USD ($)	Oct. 31, 2015 CAD	Oct. 31, 2017 CAD	Oct. 31, 2016 CAD	Oct. 31, 2015 CAD
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 37,735,347	CAD 49,380,475	$ 26,133,576	CAD 34,684,482	$ 127,858,942	CAD 159,051,217
Principal redemptions	64,137,640	83,929,646	41,053,575	54,486,305	127,864,231	159,056,760
Withdrawals (to pay expenses)	764,437	CAD 726,489	840,409	CAD 1,085,107	869,218	CAD 336,437
Deposits, interest bearing	$ 176,006,303		$ 195,609,315		$ 216,342,962		CAD 226,889,725	CAD 262,165,385	CAD 283,052,315

X

- 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://www.xbrl.org/2003/role/presentationRef
-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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- References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (d)-(g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

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- Definition

The cash outflow for reacquisition of callable preferred stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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