Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 03, 2018	Mar. 04, 2017
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 1,892,551	$ 1,894,061
Accumulated Amortization	(1,335,608)	(1,212,155)
Net	556,943	681,906
Gross Carrying Amount, Total	1,926,051	1,927,561
Net, Total	590,443	715,406
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	33,500	33,500
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	379,355	386,636
Accumulated Amortization	(316,798)	(308,766)
Net	$ 62,557	$ 77,870
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	$ 900,111	$ 894,330
Accumulated Amortization	(801,706)	(764,840)
Net	$ 98,405	$ 129,490
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	$ 465,000	$ 465,000
Accumulated Amortization	(172,635)	(110,653)
Net	$ 292,365	$ 354,347
Remaining Weighted Average Amortization Period	15 years	16 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	(6,172)	(3,872)
Net	$ 51,328	$ 53,628
Remaining Weighted Average Amortization Period	23 years	24 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	$ 58,995
Accumulated Amortization	(22,617)	(14,188)
Net	$ 36,368	$ 44,807
Remaining Weighted Average Amortization Period	5 years	6 years
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 20,100	$ 20,100
Accumulated Amortization	(5,394)	(3,383)
Net	$ 14,706	$ 16,717
Remaining Weighted Average Amortization Period	8 years	9 years
Backlog
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 11,500	$ 11,500
Accumulated Amortization	(10,286)	(6,453)
Net	$ 1,214	$ 5,047
Remaining Weighted Average Amortization Period	1 year	2 years