Reclassifications from Accumulated Other Comprehensive Loss (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2015	Nov. 29, 2014	Aug. 30, 2014	May 31, 2014	Mar. 01, 2014	Nov. 30, 2013	Aug. 31, 2013	Jun. 01, 2013	Feb. 28, 2015	Mar. 01, 2014	Mar. 02, 2013
Reclassification from accumulated other comprehensive loss
Income before income taxes	$ 119,067	$ 106,717	$ 147,709	$ 53,327	$ 49,371	$ 72,936	$ 35,037	$ 92,874	$ 426,820	$ 250,218	$ 7,505
Income tax benefit	1,715,965	(1,871)	(19,860)	(11,881)	6,006	(1,388)	(2,210)	(3,212)	1,682,353	(804)	110,600
Net income	1,835,032	104,846	127,849	41,446	55,377	71,548	32,827	89,662	2,109,173	249,414	118,105
Defined benefit pension plans | Reclassification from accumulated other comprehensive loss
Reclassification from accumulated other comprehensive loss
Income before income taxes									(3,526)	(4,824)	(5,032)
Income tax benefit									1,464
Net income									(2,062)	(4,824)	(5,032)
Defined benefit pension plans | Reclassification from accumulated other comprehensive loss | Selling, general and administrative expenses
Reclassification from accumulated other comprehensive loss
Amortization of unrecognized prior service cost									(240)	(240)	(240)
Amortization of unrecognized net loss									$ (3,286)	$ (4,584)	$ (4,792)