Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Feb. 24, 2017	Feb. 26, 2016	Feb. 27, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 124.6	$ 170.3	$ 86.1
Unrealized gain (loss) on investments	(1.4)	(0.2)	0.0
Pension and other post-retirement liability adjustments	4.7	2.6	(16.8)
Derivative adjustments	0.0	0.0	0.1
Foreign currency translation adjustments	(12.4)	(12.2)	(19.2)
Total other comprehensive income (loss), gross	(9.1)	(9.8)	(35.9)
Unrealized gain (loss) on investments	0.5	0.0	0.0
Pension and other post-retirement liability adjustments	(2.4)	(0.4)	5.7
Derivative adjustments	0.0	0.0	0.0
Foreign currency translation adjustments	0.0	0.0	0.0
Total other comprehensive income (loss), tax (expense) benefit	(1.9)	(0.4)	5.7
Unrealized gain (loss) on investments	(0.9)	(0.2)	0.0
Pension and other post-retirement liability adjustments	2.3	2.2	(11.1)
Derivative adjustments	0.0	0.0	0.1
Foreign currency translation adjustments	(12.4)	(12.2)	(19.2)
Total other comprehensive income (loss), net	(11.0)	(10.2)	(30.2)
Comprehensive income	$ 113.6	$ 160.1	$ 55.9