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Canadian Dollar Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Jan. 31, 2018 USD ($)	Jan. 31, 2018 CAD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2017 CAD ($)	Jan. 31, 2018 CAD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CAD ($)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 15,597,038	$ 19,729,044	$ 11,123,338	$ 49,380,475
Principal redemptions	15,596,356	19,729,276	22,234,112	83,929,646
Withdrawals (to pay expenses)	177,847	$ 4,300	$ 202,204	$ 726,489
Deposits, interest bearing	$ 184,933,115				$ 226,885,193	$ 176,006,303	$ 226,889,725

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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