Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 28, 2015	Aug. 29, 2014	Aug. 28, 2015	Aug. 29, 2014	Feb. 28, 2015
Defined Benefit Plan Disclosure [Line Items]
Liability for postretirement benefits other than pensions	$ 19.2	$ 19.7	$ 19.2	$ 19.7	$ 17.5
Long-term liability for pension benefits	78.6	74.5	78.6	74.5	$ 81.9
Profit-Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the 401(k) employee contribution plan			3.4	5.5
401 (k) [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the 401(k) employee contribution plan	$ 1.3	$ 1.3	$ 2.6	$ 2.6