Goodwill and Other Intangibles - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 02, 2019	Mar. 03, 2018
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 1,826,689	$ 1,892,551
Accumulated Amortization	(1,397,483)	(1,335,608)
Net	429,206	556,943
Gross Carrying Amount, Total	1,846,189	1,926,051
Net, Total	448,706	590,443
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	19,500	33,500
Pharmacy Services | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Impairment charge of indefinite-lived intangible assets	14,000
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	370,855	379,355
Accumulated Amortization	(318,503)	(316,798)
Net	$ 52,352	$ 62,557
Remaining Weighted Average Amortization Period	7 years	7 years
Prescription files
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 919,749	$ 900,111
Accumulated Amortization	(827,222)	(801,706)
Net	$ 92,527	$ 98,405
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	$ 465,000
Accumulated Amortization	(193,352)	(172,635)
Net	$ 194,648	$ 292,365
Remaining Weighted Average Amortization Period	13 years	15 years
Customer relationships | Pharmacy Services
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 77,000
Accumulated Amortization	28,795
Impairment charge of finite-lived intangible assets	48,205
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	57,500	$ 57,500
Accumulated Amortization	(8,472)	(6,172)
Net	$ 49,028	$ 51,328
Remaining Weighted Average Amortization Period	22 years	23 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	(31,030)	(22,617)
Net	$ 27,955	$ 36,368
Remaining Weighted Average Amortization Period	4 years	5 years
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 20,100	$ 20,100
Accumulated Amortization	(7,404)	(5,394)
Net	$ 12,696	$ 14,706
Remaining Weighted Average Amortization Period	7 years	8 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)	(10,286)
Net		$ 1,214
Remaining Weighted Average Amortization Period	0 years	1 year