Supplementary Cash Flow Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 27, 2016	Feb. 28, 2015	Mar. 01, 2014
Supplementary Cash Flow Data
Cash paid for interest (net of capitalized amounts of $196, $145 and $197)	$ 403,727	$ 384,329	$ 414,692
Capitalized amount of interest	196	145	197
Cash payments for income taxes, net	4,856	6,665	3,191
Equipment financed under capital leases	9,614	6,157	18,065
Equipment received for noncash consideration	3,011	1,600	2,825
Preferred stock dividends paid in additional shares			8,318
Accrued capital expenditures	69,417	87,916	72,841
Gross borrowings from revolver	4,729,000	6,078,000	2,668,000
Gross repayments to revolver	$ 4,354,000	$ 4,753,000	$ 2,933,000