Goodwill and Other Intangible Assets - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 01, 2019	Mar. 02, 2019
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Goodwill impairment	$ 0
Gross Carrying Amount of Finite Lived	1,642,621	$ 1,826,689
Accumulated Amortization	(1,262,037)	(1,397,483)
Net	380,584	429,206
Gross Carrying Amount, Total	1,662,121	1,846,189
Net, Total	400,084	448,706
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	19,500	19,500
Pharmacy Services
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Accumulated impairment losses	574,712	574,712
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	180,435	370,855
Accumulated Amortization	(158,605)	(318,503)
Net	$ 21,830	$ 52,352
Remaining Weighted Average Amortization Period	3 years	7 years
Prescription files
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 926,101	$ 919,749
Accumulated Amortization	(837,819)	(827,222)
Net	$ 88,282	$ 92,527
Remaining Weighted Average Amortization Period	3 years	3 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 388,000	$ 388,000
Accumulated Amortization	(204,023)	(193,352)
Net	$ 183,977	$ 194,648
Remaining Weighted Average Amortization Period	12 years	13 years
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 57,500	$ 57,500
Accumulated Amortization	(9,047)	(8,472)
Net	$ 48,453	$ 49,028
Remaining Weighted Average Amortization Period	21 years	22 years
Claims adjudication and other developed software
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 58,985	$ 58,985
Accumulated Amortization	(33,137)	(31,030)
Net	$ 25,848	$ 27,955
Remaining Weighted Average Amortization Period	3 years	4 years
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 20,100	$ 20,100
Accumulated Amortization	(7,906)	(7,404)
Net	$ 12,194	$ 12,696
Remaining Weighted Average Amortization Period	6 years	7 years
Backlog
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 11,500	$ 11,500
Accumulated Amortization	$ (11,500)	$ (11,500)
Remaining Weighted Average Amortization Period	0 years	0 years