Goodwill and Other Intangible Assets - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 28, 2022	Feb. 26, 2022
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Goodwill impairment	$ 0
Accumulated impairment losses	803,712	$ 803,712
Gross Carrying Amount, Finite Lived	1,741,678	1,743,805
Accumulated Amortization	(1,473,128)	(1,467,009)
Net	268,550	276,796
Gross Carrying Amount, Total	1,756,078	1,758,205
Net, Total	282,950	291,196
Other intangibles, net	282,950	291,196
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Indefinite Lived	14,400	14,400
Noncompete agreements and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	199,351	197,651
Accumulated Amortization	(179,046)	(178,958)
Net	$ 20,305	$ 18,693
Remaining Weighted Average Amortization Period	3 years	3 years
Prescription files
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 1,026,342	$ 1,030,169
Accumulated Amortization	(914,911)	(918,773)
Net	$ 111,431	$ 111,396
Remaining Weighted Average Amortization Period	5 years	6 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 388,000	$ 388,000
Accumulated Amortization	(291,770)	(286,090)
Net	$ 96,230	$ 101,910
Remaining Weighted Average Amortization Period	9 years	10 years
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 57,500	$ 57,500
Accumulated Amortization	(17,478)	(15,372)
Net	$ 40,022	$ 42,128
Remaining Weighted Average Amortization Period	4 years	5 years
Claims adjudication and other developed software
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 58,985	$ 58,985
Accumulated Amortization	(58,423)	(56,316)
Net	$ 562	$ 2,669
Remaining Weighted Average Amortization Period	0 years	1 year
Backlog
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 11,500	$ 11,500
Accumulated Amortization	$ (11,500)	$ (11,500)
Remaining Weighted Average Amortization Period	0 years	0 years
EI (Elixir Insurance) | CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Remaining Weighted Average Amortization Period	5 years	19 years