Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				3 Months Ended		9 Months Ended
	Nov. 29, 2013	Feb. 28, 2013	Nov. 23, 2012	Nov. 29, 2013 Domestic [Member]	Nov. 23, 2012 Domestic [Member]	Nov. 29, 2013 Domestic [Member]	Nov. 23, 2012 Domestic [Member]	Nov. 29, 2013 Profit-Sharing Plan [Member]	Nov. 23, 2012 Profit-Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the profit-sharing plan				$ 1.3	$ 2.3	$ 4.0	$ 4.9	$ 4.9	$ 3.9
Liability for postretirement benefits other than pensions	18.6	15.7	28.6
Long-term liability for pension benefits	$ 81.0	$ 81.4	$ 75.7