Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified				3 Months Ended
	May 30, 2014	Feb. 28, 2014	May 31, 2013	May 30, 2014 Profit-Sharing Plan [Member]	May 31, 2013 Profit-Sharing Plan [Member]	May 30, 2014 Defined Contribution Plans [Member] Domestic [Member]	May 31, 2013 Defined Contribution Plans [Member] Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the profit-sharing plan				$ 4.1	$ 4.0	$ 1.3	$ 1.3
Liability for postretirement benefits other than pensions	18.7	17.9	16.8
Long-term liability for pension benefits	$ 76.0	$ 77.3	$ 81.2