Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2015	Mar. 01, 2014
Net Operating Losses and Tax Credits
Alternative minimum tax credit carryforwards	$ 3,221
Period of cumulative loss	3 years	3 years
Federal
Net Operating Losses and Tax Credits
Net operating loss carryforwards	3,173,128
Amount of deductions under net operating loss carryforwards	18,365
Federal business tax credit carryforwards	49,091
Federal | Net Operating Losses expiration period 2020 and 2026
Net Operating Losses and Tax Credits
Net operating losses expiration amount	1,588,642
Federal | Net Operating Losses expiration period 2027 and 2032
Net Operating Losses and Tax Credits
Net operating losses expiration amount	1,567,808
State
Net Operating Losses and Tax Credits
Net operating loss carryforwards	4,920,730
Amount of deductions under net operating loss carryforwards	$ 66,973