Retirement Benefits - Additional Information (Detail) (USD $)	9 Months Ended		3 Months Ended
	Nov. 28, 2014	Nov. 29, 2013	Nov. 28, 2014	Nov. 29, 2013	Feb. 28, 2014
Defined Contribution Plan Disclosure [Line Items]
Liability for postretirement benefits other than pensions	$ 20,600,000	$ 18,600,000	$ 20,600,000	$ 18,600,000	$ 17,900,000
Long-term liability for pension benefits	74,800,000	81,000,000	74,800,000	81,000,000	77,300,000
Profit-Sharing Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Corporate contributions to the profit-sharing plan	7,500,000	4,900,000
401 (k) [Member] | United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Corporate contributions to the 401(k) employee contribution plan	$ 3,600,000	$ 4,000,000	$ 900,000	$ 1,300,000