Supplementary Cash Flow Data (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Feb. 28, 2015	Mar. 01, 2014	Mar. 02, 2013
Supplementary Cash Flow Data
Cash paid for interest (net of capitalized amounts of $120 and $163, respectively)	$ 384,329us-gaap_InterestPaidNet	$ 414,692us-gaap_InterestPaidNet	$ 482,145us-gaap_InterestPaidNet
Capitalized amount of interest	145us-gaap_InterestPaidCapitalized	197us-gaap_InterestPaidCapitalized	399us-gaap_InterestPaidCapitalized
Cash payments (refund) for income taxes, net	6,665us-gaap_IncomeTaxesPaidNet	3,191us-gaap_IncomeTaxesPaidNet	(776)us-gaap_IncomeTaxesPaidNet
Equipment financed under capital leases	6,157us-gaap_CapitalLeaseObligationsIncurred	18,065us-gaap_CapitalLeaseObligationsIncurred	7,906us-gaap_CapitalLeaseObligationsIncurred
Equipment received for non-cash consideration	1,600	2,825	3,285
Preferred stock dividends paid in additional shares		8,318us-gaap_DividendsPreferredStock	10,528us-gaap_DividendsPreferredStock
Accrued capital expenditures	87,916	72,841	45,456
Gross borrowings from revolver	6,078,000us-gaap_ProceedsFromLinesOfCredit	2,668,000us-gaap_ProceedsFromLinesOfCredit	1,117,000us-gaap_ProceedsFromLinesOfCredit
Gross repayments to revolver	$ 4,753,000us-gaap_RepaymentsOfLinesOfCredit	$ 2,933,000us-gaap_RepaymentsOfLinesOfCredit	$ 588,000us-gaap_RepaymentsOfLinesOfCredit

Future cash outflow to pay for purchases of fixed assets that have occurred.

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