Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	May 27, 2016	May 29, 2015	Feb. 29, 2016
Defined Contribution Plan Disclosure [Line Items]
Liability for postretirement benefits other than pensions	$ 18.5	$ 18.5	$ 17.8
Long-term liability for pension benefits	79.0	80.3	$ 80.2
Profit Sharing and Benefit Plan 401 (k) [Member] | United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer's contributions to a defined contribution retirement plan	$ 5.1	$ 2.9