Income Taxes Income Tax Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 24, 2017	Feb. 26, 2016	Feb. 27, 2015
Liability for Uncertain Tax Positions [Abstract]
Liability for uncertain tax positions, current	$ 0.0	$ 0.0
Liability for uncertain tax positions, noncurrent	0.2	0.2
Liability for uncertain tax positions, total	0.2	0.2
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits, beginning of period	8.6	8.8
Gross decreases - tax positions in prior period	(5.3)	0.0	$ (1.9)
Lapse of statute of limitations	(0.5)	(0.2)	(2.0)
Unrecognized tax benefits, end of period	$ 2.8	$ 8.6	$ 8.8