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Japanese Yen Deposits - Additional Information (Detail)	12 Months Ended
	Oct. 31, 2016 USD ($)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2015 USD ($)	Oct. 31, 2015 JPY (¥)	Oct. 31, 2014 USD ($)	Oct. 31, 2014 JPY (¥)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2015 JPY (¥)	Dec. 31, 2014 USD ($)
Cash and Cash Equivalents [Abstract]
Annual nominal rate	(0.10%)	(0.10%)
Principal deposits	$ 443,142,449	¥ 48,913,044,314	$ 415,994,461	¥ 47,636,264,433	$ 208,080,277	¥ 23,909,334,879
Principal redemptions	477,929,067	52,752,711,224	363,514,395	43,753,574,107	255,292,426	26,348,016,499
Withdrawals (to pay expenses)	832,636	¥ 91,904,462	400,849	¥ 48,247,219	$ 522,818	53,958,569
Deposits, interest bearing	$ 110,280,686		$ 128,613,360			¥ 11,685,974,118	¥ 11,588,845,853	¥ 15,520,417,225	$ 104,241,328

X

- Definition

The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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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
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: 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=66902209&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
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-Paragraph 15
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6513228

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The cash inflow from issuance of preferred stock that is classified as callable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 14
-Subparagraph (a)
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-URI http://asc.fasb.org/extlink&oid=6513228

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