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Australian Dollar Deposits - Additional Information (Detail)	9 Months Ended			12 Months Ended
	Jul. 31, 2017 USD ($)	Jul. 31, 2017 AUD	Jul. 31, 2016 USD ($)	Oct. 31, 2016 AUD	Jul. 31, 2017 AUD	Oct. 31, 2016 USD ($)	Oct. 31, 2016 AUD
Cash and Cash Equivalents [Abstract]
Principal deposits	$ 18,876,552	AUD 25,000,000	$ 10,993,512	AUD 25,000,000
Principal redemptions	30,191,441	AUD 40,000,000	$ 25,664,378	AUD 45,000,000
Deposits, interest bearing	$ 175,637,064				AUD 220,000,000	$ 178,823,221	AUD 235,000,000

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.

+ Details

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Balance Type:	na
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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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