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.