Euro Deposits - Additional Information (Detail)	9 Months Ended	12 Months Ended
Jul. 31, 2013 EUR (€)	Oct. 31, 2012 EUR (€)	Jul. 31, 2013 USD ($)	Oct. 31, 2012 USD ($)	Jul. 31, 2013 Redemptions payable [Member] USD ($)	Oct. 31, 2012 Redemptions payable [Member] USD ($)
Deposits [Line Items]
Euro principal deposits	€ 575,140,354	€ 1,278,954,563
Euro principal redemptions	624,704,200	1,258,988,057
Euro principal withdrawals	578,290	558,994
Euro principal balance	€ 153,540,025	€ 203,682,161	$ 217,026,830	$ 263,931,355	$ 203,878,152	$ 263,931,355
Interest rate on interest-bearing demand account			0.00%

For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.2)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6476743&loc=d3e59706-112781

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 9

Name:	us-gaap_InterestBearingDepositsInBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant