Commitments and Contingencies (Details Numeric) (USD $)	3 Months Ended
	Mar. 01, 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.