Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 23, 2013	Aug. 24, 2012	Aug. 23, 2013	Aug. 24, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ 0.6	$ 1.7	$ 1.8	$ 5.5
Income tax expense	18.7	15.7	23.3	22.2
Cost of sales	513.4	513.4	970.6	987.5
Operating expenses	188.9	181.0	374.0	357.7
Net income	27.6	29.5	40.8	42.7
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(1.6)		(2.5)
Unrealized gain on investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	(0.2)		(0.1)
Income tax expense	0		0
Net income	(0.2)		(0.1)
Minimum pension liability [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0.8		1.5
Net income	(1.4)		(2.4)
Actuarial Loss [Member] | Minimum pension liability [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	0.1		0.2
Operating expenses	0.2		0.5
Prior Service Costs [Member] | Minimum pension liability [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(1.2)		(2.2)
Operating expenses	$ (1.3)		$ (2.4)