Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Feb. 29, 2012 Y	Feb. 28, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]
Soft Dollar expenses	$ 8.2	$ 10.5
Minimum useful life of premise and equipment, years	3
Maximum useful life of premise and equipment, years	10

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration