Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Feb. 29, 2020	Mar. 02, 2019	Mar. 03, 2018
Restructuring related liabilities
Balance-beginning of period				$ 124,046	$ 124,046	$ 133,290	$ 165,138
Restructuring expense					105,642
Balance-end of period	$ 2,253				2,253	124,046	$ 133,290
Anticipated restructuring-related costs in fiscal 2020	60,000				60,000
Reorganization Of Executive Management Team, Ongoing Workforce Reduction And Consolidation, And Transformation Initiatives [Member]
Restructuring related liabilities
Balance-beginning of period	51,297	$ 36,146	$ 33,549	4,704	4,704
Restructuring expense	11,872	25,275	25,145	43,350		4,704
Cash payments	(18,115)	(10,124)	(22,548)	(14,505)
Balance-end of period	45,054	51,297	36,146	33,549	45,054	4,704
Severance and related costs
Restructuring related liabilities
Balance-beginning of period	38,508	26,224	22,423
Restructuring expense	5,716	17,320	8,381	27,076	58,493
Cash payments	(7,996)	(5,036)	(4,580)	(4,653)
Balance-end of period	36,228	38,508	26,224	22,423	36,228
Non-executive retention costs
Restructuring related liabilities
Balance-beginning of period	5,281	4,013	11,126	4,704	4,704
Restructuring expense	1,151	1,268	4,087	6,664	13,170	4,704
Cash payments			(11,200)	(242)
Balance-end of period	6,432	5,281	4,013	11,126	6,432	4,704
Professional and other fees
Restructuring related liabilities
Balance-beginning of period	7,508	5,909
Restructuring expense	5,005	6,687	12,677	9,610	33,979
Cash payments	(10,119)	(5,088)	(6,768)	$ (9,610)
Balance-end of period	$ 2,394	$ 7,508	$ 5,909		2,394
Retail Pharmacy
Restructuring related liabilities
Restructuring expense					87,738	3,224
Retail Pharmacy | Severance and related costs
Restructuring related liabilities
Restructuring expense					47,154
Retail Pharmacy | Non-executive retention costs
Restructuring related liabilities
Restructuring expense					8,927	3,224
Retail Pharmacy | Professional and other fees
Restructuring related liabilities
Restructuring expense					31,657
Pharmacy Services
Restructuring related liabilities
Restructuring expense					17,904	1,480
Pharmacy Services | Severance and related costs
Restructuring related liabilities
Restructuring expense					11,339
Pharmacy Services | Non-executive retention costs
Restructuring related liabilities
Restructuring expense					4,243	$ 1,480
Pharmacy Services | Professional and other fees
Restructuring related liabilities
Restructuring expense					$ 2,322