Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 03, 2017	Mar. 04, 2017	May 28, 2016	Mar. 04, 2017
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Goodwill, Impairment Loss	$ 0	$ 0
Gross Carrying Amount of Finite Lived	2,864,022	2,862,005		$ 2,862,005
Accumulated Amortization	(2,109,553)	(2,059,710)		(2,059,710)
Net	754,469	802,295		802,295
Gross Carrying Amount of Indefinite Lived	33,500
Gross Carrying Amount, Total	2,897,522	2,895,505		2,895,505
Net, Total	787,969	835,795		835,795
Unfavorable lease intangibles	37,053	38,242		38,242
Amortization expense for intangible assets and liabilities	54,932		$ 55,503
Anticipated annual amortization expense for intangible assets and liabilities
2018	181,675
2019	144,555
2020	115,010
2021	82,456
2022	53,534
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Indefinite Lived	33,500	33,500		33,500
Favorable leases and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount of Finite Lived	663,949	664,670		664,670
Accumulated Amortization	(537,884)	(531,022)		(531,022)
Net	$ 126,065	133,648		$ 133,648
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	$ 1,586,981	1,584,240		$ 1,584,240
Accumulated Amortization	(1,412,404)	(1,390,139)		(1,390,139)
Net	$ 174,577	194,101		$ 194,101
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		$ 465,000
Accumulated Amortization	(127,226)	(110,653)		(110,653)
Net	$ 337,774	354,347		$ 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		$ 57,500
Accumulated Amortization	(4,447)	(3,872)		(3,872)
Net	$ 53,053	53,628		$ 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	$ 58,992	58,995		$ 58,995
Accumulated Amortization	(16,295)	(14,188)		(14,188)
Net	$ 42,697	44,807		$ 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		$ 20,100
Accumulated Amortization	(3,886)	(3,383)		(3,383)
Net	$ 16,214	16,717		$ 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		$ 11,500
Accumulated Amortization	(7,411)	(6,453)		(6,453)
Net	$ 4,089	$ 5,047		$ 5,047
Remaining Weighted Average Amortization Period	1 year			2 years