Capital Stock (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2009	Mar. 03, 2012	Feb. 26, 2011
Capital stock
Authorized shares of common stock		1,500,000	1,500,000
Authorized shares of preferred stock		20,000	20,000
Par value of common stock (in dollars per share)		$ 1	$ 1
Par value of preferred stock (in dollars per share)		$ 1	$ 1
Preferred stock Series G
Capital stock
Authorized shares of preferred stock		2,000	2,000
Par value of preferred stock (in dollars per share)		$ 1	$ 1
Liquidation preference (in dollars per share)		$ 100	$ 100
Dividend rate of liquidation preference (as a percent)		7.00%
Number of shares of preferred stock converted into common shares	27,137
Conversion rate (in dollars per share)	$ 5.50
Preferred stock Series H
Capital stock
Authorized shares of preferred stock		2,000	2,000
Par value of preferred stock (in dollars per share)		$ 1	$ 1
Liquidation preference (in dollars per share)		$ 100	$ 100
Dividend rate of liquidation preference (as a percent)		6.00%
Conversion rate (in dollars per share)		$ 5.50
Redemption percentage of the liquidation preference per share		105.00%