Goodwill and Other Intangibles - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 01, 2018	Dec. 01, 2018	Mar. 03, 2018
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	$ 1,830,719	$ 1,830,719	$ 1,892,551
Accumulated Amortization	(1,387,857)	(1,387,857)	(1,335,608)
Net	442,862	442,862	556,943
Gross Carrying Amount, Total	1,850,219	1,850,219	1,926,051
Net, Total	462,362	462,362	590,443
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	19,500	19,500	33,500
Pharmacy Services | Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Impairment charge of indefinite-lived intangible assets	0	14,000
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	375,982	375,982	379,355
Accumulated Amortization	(321,545)	(321,545)	(316,798)
Net	54,437	$ 54,437	$ 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	918,652	$ 918,652	$ 900,111
Accumulated Amortization	(828,410)	(828,410)	(801,706)
Net	90,242	$ 90,242	$ 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	$ 388,000	$ 465,000
Accumulated Amortization	(182,681)	(182,681)	(172,635)
Net	205,319	$ 205,319	$ 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	$ 77,000
Accumulated Amortization	(28,795)	(28,795)
Impairment charge of finite-lived intangible assets	0	48,205
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	57,500	57,500	$ 57,500
Accumulated Amortization	(7,897)	(7,897)	(6,172)
Net	49,603	$ 49,603	$ 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	$ 58,985
Accumulated Amortization	(28,923)	(28,923)	(22,617)
Net	30,062	$ 30,062	$ 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	$ 20,100
Accumulated Amortization	(6,901)	(6,901)	(5,394)
Net	13,199	$ 13,199	$ 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	$ 11,500
Accumulated Amortization	$ (11,500)	$ (11,500)	(10,286)
Net			$ 1,214
Remaining Weighted Average Amortization Period		0 years	1 year