Regulatory Requirements (Narrative) (Details)	Oct. 31, 2011
Regulatory Requirements [Abstract]
Leverage ratio	33.6

Total Aggregate Indebtedness divided by Net Capital.

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

-Publisher SEC

-Name Rule 15c3

-Number 240

-Article 15c3

-Section 1

-Subsection a

-Paragraph 1

-Subparagraph i

Name:	us-gaap_RatioOfIndebtednessToNetCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant