Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	May. 29, 2015	May. 30, 2014	Feb. 28, 2015
Defined Benefit Plan Disclosure [Line Items]
Liability for postretirement benefits other than pensions	$ 18.5	$ 18.7	$ 17.5
Long-term liability for pension benefits	80.3	76.0	$ 81.9
Profit-Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the 401(k) employee contribution plan	1.7	4.1
401 (k) [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the 401(k) employee contribution plan	$ 1.2	$ 1.3