Accumulated Other Comprehensive Income (Loss) Reclassification from Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2014	Nov. 22, 2013	Aug. 23, 2013	May 24, 2013	Feb. 22, 2013	Nov. 23, 2012	Aug. 24, 2012	May 25, 2012	Feb. 28, 2014	Feb. 22, 2013	Feb. 24, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses									$ 757.0	$ 727.0	$ 708.3
Income tax expense									(59.5)	(16.1)	(25.3)
Cost of sales									2,046.5	1,987.8	1,913.6
Net income	23.9	23.0	27.6	13.2	(27.5)	23.6	29.5	13.2	87.7	38.8	56.7
Other income (expense), net									(0.6)	9.7	5.3
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income									(5.8)
Unrealized gain on investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense									0
Net income									(0.1)
Other income (expense), net									(0.1)
Minimum pension liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense									(1.9)
Net income									(5.7)
Actuarial Loss [Member] | Minimum pension liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses									1.2
Cost of sales									0.3
Prior Service Costs [Member] | Minimum pension liability [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses									(4.8)
Cost of sales									$ (4.3)