Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 27, 2015	Nov. 28, 2014	Nov. 27, 2015	Nov. 28, 2014	Feb. 28, 2015
Defined Benefit Plan Disclosure [Line Items]
Liability for postretirement benefits other than pensions	$ 19.8	$ 20.6	$ 19.8	$ 20.6	$ 17.5
Long-term liability for pension benefits	76.9	74.8	76.9	74.8	$ 81.9
Profit Sharing and Benefit Plan 401 (k) [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Corporate contributions to the profit-sharing plan	$ 3.0	$ 3.0	$ 8.9	$ 11.1