Benefit Plans (Details 5) (Pension Benefits [Member])	12 Months Ended
	Feb. 25, 2012	Feb. 26, 2011
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Real Estate	8.50%	7.30%
Target Allocation percentage of assets, Real Estate	10.00%
Plan assets allocation, Total	100.00%	100.00%
Domestic Equity [Member]
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Equity Securities	33.90%	35.50%
Target allocation percentage of assets, Equity Securities	31.80%
International Equity [Member]
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Equity Securities	17.80%	18.00%
Target allocation percentage of assets, Equity Securities	15.70%
Private Equity [Member]
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Equity Securities	4.80%	3.50%
Target allocation percentage of assets, Equity Securities	7.50%
Fixed Income Funds [Member]
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Debt Securities	35.00%	35.60%
Target Allocation percentage of assets, Debt Securities	35.00%
Cash and other [Member]
The asset allocation guidelines and the actual allocation of pension plan assets
Plan assets allocation, Other plan assets	0.00%	0.10%
Target Allocation percentage of assets, Cash and other	0.00%