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Australian Dollar Deposits - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Jan. 31, 2018 USD ($)	Jan. 31, 2018 AUD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2017 AUD ($)	Jan. 31, 2018 AUD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 AUD ($)
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 3,872,577	$ 5,000,000	$ 14,883,020	$ 45,000,000
Principal redemptions	19,361,957	$ 25,000,000	$ 14,878,149	$ 95,000,000
Deposits, interest bearing	$ 133,608,756				$ 165,000,000	$ 141,848,757	$ 185,000,000

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

+ Details

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X

- References

No definition available.

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X

- 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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X

- 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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