Goodwill and Other Intangible Assets - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2020	Mar. 02, 2019
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Goodwill impairment	$ 0	$ (312,984)
Gross Carrying Amount, Finite Lived	1,673,155	1,826,689
Accumulated Amortization	(1,333,164)	(1,397,483)
Net	339,991	429,206
Gross Carrying Amount, Total	1,692,655	1,846,189
Net, Total	359,491	448,706
Other intangibles, net	359,491	448,706
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Indefinite Lived	19,500	19,500
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		14,000
Favorable leases, noncompete agreements and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	186,183	370,855
Accumulated Amortization	(163,575)	(318,503)
Net	$ 22,608	$ 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, Finite Lived	$ 950,887	$ 919,749
Accumulated Amortization	(867,430)	(827,222)
Net	$ 83,457	$ 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, Finite Lived	$ 388,000	$ 388,000
Accumulated Amortization	(231,015)	(193,352)
Net	$ 156,985	$ 194,648
Remaining Weighted Average Amortization Period	12 years	13 years
Net impairment charge		$ 48,205
Gross carrying amount of assets impaired		77,000
Accumulated amortization of assets impaired		28,795
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite Lived	$ 57,500	57,500
Accumulated Amortization	(10,772)	(8,472)
Net	$ 46,728	$ 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, Finite Lived	$ 58,985	$ 58,985
Accumulated Amortization	(39,459)	(31,030)
Net	$ 19,526	$ 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, Finite Lived	$ 20,100	$ 20,100
Accumulated Amortization	(9,413)	(7,404)
Net	$ 10,687	$ 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, Finite Lived	$ 11,500	$ 11,500
Accumulated Amortization	$ (11,500)	$ (11,500)
Remaining Weighted Average Amortization Period	0 years	0 years
EIC
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Other intangibles, net	$ 30,187
EIC | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Other intangibles, net	19,500
EIC | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Other intangibles, net	$ 10,687