Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 22, 2013	Feb. 24, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 87.7	$ 38.8	$ 56.7
Unrealized gain (loss) on investments	0.3	2.5	(0.7)
Pension and other post-retirement liability adjustments	1.1	0	0.5
Derivative adjustments	0	0	(0.2)
Foreign currency translation adjustments	4.1	(5.8)	0.8
Total other comprehensive income (loss), gross	5.5	(3.3)	0.4
Unrealized gain (loss) on investments	(0.1)	(0.9)	0.3
Pension and other post-retirement liability adjustments	(0.4)	(0.8)	(0.6)
Derivative adjustments	0	0	0.1
Foreign currency translation adjustments	0	0	0
Total other comprehensive income (loss), tax (expense) benefit	(0.5)	(1.7)	(0.2)
Unrealized gain (loss) on investments	0.2	1.6	(0.4)
Pension and other post-retirement liability adjustments	0.7	(0.8)	(0.1)
Derivative adjustments	0	0	(0.1)
Foreign currency translation adjustments	4.1	(5.8)	0.8
Total other comprehensive income (loss), net	5.0	(5.0)	0.2
Comprehensive income	$ 92.7	$ 33.8	$ 56.9