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Segment Information (Summary Of Property And Equipment By Major Country) (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2012
Nov. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 93,426 $ 89,871
United States [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 82,249 83,500
United Kingdom [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 1,315 1,386
Other [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 9,862 $ 4,985