Inventory (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Feb. 28, 2015	Mar. 01, 2014	Feb. 28, 2015	Mar. 01, 2014	Mar. 02, 2013
Inventory
Inventories, last-in, first-out (LIFO) cost flow assumption	$ 997,528	$ 1,018,581	$ 997,528	$ 1,018,581
LIFO (credit) charge	(23,489)	44,142	(18,857)	104,142	(147,882)
Amount of decrease in the cost of sales due to the effect of LIFO inventory liquidation			$ 38,867	$ 13,894	$ 4,316