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Canadian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 31, 2017 CAD	Jul. 31, 2016 USD ($)	Oct. 31, 2016 CAD	Jul. 31, 2017 CAD	Oct. 31, 2016 USD ($)	Oct. 31, 2016 CAD
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 29,746,940	CAD 39,515,834	$ 18,604,755	CAD 34,684,482
Principal redemptions	40,902,777	64,200,326	26,036,050	54,486,305
Withdrawals (to pay expenses)	570,532	CAD 672,668	$ 633,898	CAD 1,085,107
Deposits, interest bearing	$ 189,363,260				CAD 236,808,225	$ 195,609,315	CAD 262,165,385

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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