Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Feb. 22, 2013	Feb. 24, 2012
Accounts receivable, allowances	$ 14.5	$ 19.6
Property, plant and equipment, accumulated depreciation	(1,221.4)	(1,215.3)
Other intangible assets, accumulated amortization	$ 46.6	$ 60.2
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	125,200,000	126,500,000
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	86,010,584	85,260,736
Common stock, shares outstanding	86,010,584	85,260,736
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	39,154,003	41,228,593
Common stock, shares outstanding	39,154,003	41,228,593