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Australian Dollar Deposits - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2017 USD ($)	Oct. 31, 2017 AUD	Oct. 31, 2016 USD ($)	Oct. 31, 2016 AUD	Oct. 31, 2015 USD ($)	Oct. 31, 2015 AUD	Oct. 31, 2017 AUD	Oct. 31, 2016 AUD	Oct. 31, 2015 AUD
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 34,369,885	AUD 45,000,000	$ 18,499,561	AUD 25,000,000	$ 108,329,725	AUD 140,000,000
Principal redemptions	72,530,089	AUD 95,000,000	33,314,772	AUD 45,000,000	166,357,064	AUD 215,000,000
Deposits, interest bearing	$ 141,848,757		$ 178,823,221		$ 181,929,740		AUD 185,000,000	AUD 235,000,000	AUD 255,000,000

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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Period Type:	instant

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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