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Commitments and Contingencies (Details Numeric) (USD $)
3 Months Ended 9 Months Ended
Mar. 01, 2013
Aug. 30, 2013
buildings
Nov. 30, 2012
Property Subject to or Available for Operating Lease [Line Items]      
Number of Corporate Headquarter Office Buildings   3  
Lease Receivable Purchased   $ 207,239,000 $ 207,239,000 [1]
Capital Lease Obligations [Abstract]      
Capital Lease Obligations Incurred 25,700,000    
Sale-leaseback agreement period 24 months    
East and West Towers [Member]
     
Property Subject to or Available for Operating Lease [Line Items]      
Lease Receivable Purchased   126,800,000  
Option to Purchase Buildings   143,200,000  
Residual Value Guarantees   126,800,000  
Almaden Tower [Member]
     
Property Subject to or Available for Operating Lease [Line Items]      
Lease Receivable Purchased   80,400,000  
Option to Purchase Buildings   103,600,000  
Residual Value Guarantees   89,400,000  
East and West Towers and Almaden Tower [Domain]
     
Property Subject to or Available for Operating Lease [Line Items]      
Standby letter of credit   $ 16,600,000  
[1] The Condensed Consolidated Balance Sheet as of November 30, 2012 has been derived from the audited Consolidated Financial Statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.