Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Feb. 28, 2014	Feb. 22, 2013
Accounts receivable, allowances	$ 13.0	$ 14.5
Property, plant and equipment, accumulated depreciation	(1,140.8)	(1,221.4)
Other intangible assets, accumulated amortization	$ 41.8	$ 46.6
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares outstanding	122,900,000	125,200,000
Class A Common Stock [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	89,909,946	86,010,584
Common stock, shares outstanding	89,909,946	86,010,584
Class B Common Stock [Member]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	475,000,000	475,000,000
Common stock, shares issued	32,966,818	39,154,003
Common stock, shares outstanding	32,966,818	39,154,003