Income Taxes - Net Operating Losses and Tax Credits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 02, 2019	Mar. 03, 2018
Net Operating Losses and Tax Credits
Net tax effect of these carryforwards	$ 1,089,656
Alternative minimum tax credit carryforwards	13,497
Valuation Allowance
Valuation allowance	1,091,416	$ 896,800
Federal
Net Operating Losses and Tax Credits
Net operating loss carryforwards	1,063,382
Federal business tax credit carryforwards	28,478
Federal | Net Operating Loss Expiration Period 2029 and 2031
Net Operating Losses and Tax Credits
Net operating losses expiration amount	884,627
Federal | Net Operating Loss Expiration Period 2032 and 2037
Net Operating Losses and Tax Credits
Net operating losses expiration amount	178,246
State
Net Operating Losses and Tax Credits
Net operating loss carryforwards	$ 12,048,528