Summary of Significant Accounting Policies (Summary Of Estimated Useful Lives Of Property And Equipment) (Details)	12 Months Ended
	Nov. 30, 2012
Buildings
Significant Accounting Policies [Line Items]
Property and equipment, useful life	25 years
Furniture and fixtures
Significant Accounting Policies [Line Items]
Property and equipment, useful life	5 years
Facilities improvements
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	Shorter of the lease term or the estimated useful life
Minimum | Equipment and software
Significant Accounting Policies [Line Items]
Property and equipment, useful life	2 years
Maximum | Equipment and software
Significant Accounting Policies [Line Items]
Property and equipment, useful life	5 years