Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	May 31, 2014	Jun. 01, 2013	Mar. 01, 2014
Debt (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000
Line of Credit Facility, Expiration Date	Nov. 20, 2018
Line of Credit Facility, Amount Outstanding	0		0
Minimum net worth required	292,700
Net Worth	356,700
Adjusted debt-to-EBITDA ratio	0.28
Decrease in non-credit facility debt	25,000
Excess of non credit facility debt on unrestricted cash balances, cash equivalents and short-term marketable securities available for sale	15,000
Interest payments	100	200
Maximum [Member]
Debt (Textual) [Abstract]
Adjusted debt-to-EBITDA ratio	3.00
Industrial Revenue Bonds [Member]
Debt (Textual) [Abstract]
Debt	20,400
Notes Payable, Other Payables [Member]
Debt (Textual) [Abstract]
Debt	$ 300