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Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
Restructuring (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Nov. 30, 2019
Restructuring related liabilities
Balance-beginning of period			$ 124,046	$ 124,046
Anticipated restructuring-related costs in fiscal 2020	$ 100,000			100,000
Reorganization Of Executive Management Team, Ongoing Workforce Reduction And Consolidation, And Transformation Initiatives [Member]
Restructuring related liabilities
Balance-beginning of period	36,146	$ 33,549	4,704	4,704
Restructuring expense	25,275	25,145	43,350	93,770
Cash payments	(10,124)	(22,548)	(14,505)
Balance-end of period	51,297	36,146	33,549	51,297
Severance and related costs
Restructuring related liabilities
Balance-beginning of period	26,224	22,423
Restructuring expense	17,320	8,381	27,076	52,777
Cash payments	(5,036)	(4,580)	(4,653)
Balance-end of period	38,508	26,224	22,423	38,508
Non-executive retention costs
Restructuring related liabilities
Balance-beginning of period	4,013	11,126	4,704	4,704
Restructuring expense	1,268	4,087	6,664	12,019
Cash payments		(11,200)	(242)
Balance-end of period	5,281	4,013	11,126	5,281
Professional and other fees
Restructuring related liabilities
Balance-beginning of period	5,909
Restructuring expense	6,687	12,677	9,610	28,974
Cash payments	(5,088)	(6,768)	$ (9,610)
Balance-end of period	7,508	$ 5,909		7,508
Retail Pharmacy \| Reorganization Of Executive Management Team, Ongoing Workforce Reduction And Consolidation, And Transformation Initiatives [Member]
Restructuring related liabilities
Restructuring expense	18,415			78,851
Retail Pharmacy \| Severance and related costs
Restructuring related liabilities
Restructuring expense	10,866			44,008
Retail Pharmacy \| Non-executive retention costs
Restructuring related liabilities
Restructuring expense	862			8,191
Retail Pharmacy \| Professional and other fees
Restructuring related liabilities
Restructuring expense	6,687			26,652
Pharmacy Services \| Reorganization Of Executive Management Team, Ongoing Workforce Reduction And Consolidation, And Transformation Initiatives [Member]
Restructuring related liabilities
Restructuring expense	6,860			14,919
Pharmacy Services \| Severance and related costs
Restructuring related liabilities
Restructuring expense	6,454			8,769
Pharmacy Services \| Non-executive retention costs
Restructuring related liabilities
Restructuring expense	$ 406			3,828
Pharmacy Services \| Professional and other fees
Restructuring related liabilities
Restructuring expense				$ 2,322