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Summary Of Significant Accounting Policies (Summary Of Estimated Useful Lives Of Property And Equipment) (Details)
12 Months Ended
Nov. 30, 2011
years
Buildings [Member]
 
Significant Accounting Policies [Line Items]  
Property and equipment, useful life, in years 25
Equipment And Software [Member]
 
Significant Accounting Policies [Line Items]  
Property and equipment, useful life, minimum, in years 2
Property and equipment, useful life, maximum, in years 5
Furniture And Fixtures [Member]
 
Significant Accounting Policies [Line Items]  
Property and equipment, useful life, in years 5
Facilities Improvements [Member]
 
Significant Accounting Policies [Line Items]  
Property and equipment, estimated useful life Shorter of the lease term or the estimated useful life