Income Taxes - Net Operating Losses and Tax Credits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 03, 2018	Mar. 04, 2017
Net Operating Losses and Tax Credits
Net tax effect of these carryforwards	$ 1,106,710
Alternative minimum tax credit carryforwards	33,410
Valuation Allowance
Valuation allowance	896,800	$ 226,726
Federal
Net Operating Losses and Tax Credits
Net operating loss carryforwards	1,021,264
Federal business tax credit carryforwards	45,676
Federal | Net Operating Loss Expiration Period 2029 and 2031
Net Operating Losses and Tax Credits
Net operating losses expiration amount	813,238
Federal | Net Operating Loss Expiration Period 2032 and 2037
Net Operating Losses and Tax Credits
Net operating losses expiration amount	208,026
State
Net Operating Losses and Tax Credits
Net operating loss carryforwards	$ 12,602,741