Debt (Details Textual) (USD $)	May 25, 2012	Feb. 29, 2012	May 27, 2011
Debt Instrument [Line Items]
Quoted market prices of Corporation's publicly traded debt, carrying value	$ 225,181,000	$ 225,181,000	$ 233,298,000
Long and Short Term Debt (Textual) [Abstract]
Letters of credit outstanding	30,600,000
Debt due within one year	0	0	0
Long-term debt net of unamortized discounts	0	0	21,600,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility potential maximum borrowing capacity	400,000,000
Balances outstanding under the revolving credit facility	0	0	0
Accounts Receivable Facility [Member]
Debt Instrument [Line Items]
Available financing of receivables purchase agreement	70,000,000
Receivables Purchase Facility Amount Outstanding	0	0	0
7.375% senior notes, due 2021 [Member]
Debt Instrument [Line Items]
Quoted market prices of Corporation's publicly traded debt, carrying value	225,000,000	225,000,000
Interest rate of debt	7.375%
7.375% senior notes, due 2016 [Member]
Debt Instrument [Line Items]
Quoted market prices of Corporation's publicly traded debt, carrying value			213,323,000
Interest rate of debt	7.375%
7.375% notes, due 2016 [Member]
Debt Instrument [Line Items]
Quoted market prices of Corporation's publicly traded debt, carrying value			19,794,000
Interest rate of debt	7.375%
6.10% senior notes, due 2028 [Member]
Debt Instrument [Line Items]
Quoted market prices of Corporation's publicly traded debt, carrying value	181,000	181,000	181,000
Interest rate of debt	6.10%
Publicly Traded [Member]
Debt Instrument [Line Items]
Fair value of the traded debt	229,100,000	239,600,000	240,800,000
Quoted market prices of Corporation's publicly traded debt, carrying value	$ 225,200,000	$ 225,200,000	$ 233,300,000