Summary of Significant Accounting Policies - Impact of revenue adoption (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Mar. 02, 2019	Mar. 04, 2018	Mar. 03, 2018	Mar. 04, 2017
New accounting pronouncements
Accounts receivable, net	$ 1,286,785	$ 1,788,712	$ 1,811,203	$ 1,869,100
Inventories, net	1,921,604	1,871,941	1,850,660	1,799,539
Deferred tax assets	16,680	409,084	592,235	594,019
Assets	9,452,369	7,591,367	8,980,767	8,989,327
Accumulated deficit	(5,222,194)	(4,713,244)	(4,291,031)	(4,282,471)
Total stockholders' equity	$ 674,527	$ 1,186,690	1,592,450	$ 1,601,010	$ 614,070
Revenue Adjustments
New accounting pronouncements
Accounts receivable, net			(57,897)
Inventories, net			51,121
Deferred tax assets			(1,784)
Assets			(8,560)
Accumulated deficit			(8,560)
Total stockholders' equity			(8,560)
Accounting Standards Update 2014-09 | Revenue Adjustments
New accounting pronouncements
Accounts receivable, net			(57,897)
Inventories, net			51,121
Deferred tax assets			(1,784)
Accumulated deficit			$ (8,560)