Income Taxes Income Tax Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 22, 2013	Feb. 24, 2012
Liability for Uncertain Tax Positions [Abstract]
Liability for uncertain tax positions, current	$ 0	$ 0.3
Liability for uncertain tax positions, noncurrent	2.2	1.6
Liability for uncertain tax positions, total	2.2	1.9
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits, beginning of period	12.2	11.5	0.1
Gross increases - tax positions in prior period	0.4	1.6	0
Gross decreases - tax positions in prior period	0	(0.9)	0
Gross increases - tax positions in current period	0.1	0	11.5
Lapse of statute of limitations	0	0	(0.1)
Unrecognized tax benefits, end of period	12.7	12.2	11.5
Unrecognized Tax Benefits - Other Information [Abstract]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	10.5
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2.2