Goodwill and Other Intangible Assets - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 30, 2020	Feb. 29, 2020
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Goodwill impairment	$ 0
Accumulated impairment losses	574,712	$ 574,712
Gross Carrying Amount, Finite Lived	1,662,131	1,673,155
Accumulated Amortization	(1,345,927)	(1,333,164)
Net	316,204	339,991
Gross Carrying Amount, Total	1,662,131	1,692,655
Net, Total	316,204	359,491
Other intangibles, net	316,204	359,491
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Indefinite Lived		19,500
Impairment of intangible assets	29,852
Noncompete agreements and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	189,073	186,183
Accumulated Amortization	(165,712)	(163,575)
Net	$ 23,361	$ 22,608
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	$ 957,073	$ 950,887
Accumulated Amortization	(875,955)	(867,430)
Net	$ 81,118	$ 83,457
Remaining Weighted Average Amortization Period	3 years	3 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 388,000	$ 388,000
Accumulated Amortization	(239,848)	(231,015)
Net	$ 148,152	$ 156,985
Remaining Weighted Average Amortization Period	11 years	12 years
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 57,500	$ 57,500
Accumulated Amortization	(11,346)	(10,772)
Net	$ 46,154	$ 46,728
Remaining Weighted Average Amortization Period	20 years	21 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	(41,566)	(39,459)
Net	$ 17,419	$ 19,526
Remaining Weighted Average Amortization Period	2 years	3 years
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived		$ 20,100
Accumulated Amortization		(9,413)
Net		$ 10,687
Remaining Weighted Average Amortization Period	0 years	6 years
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