Goodwill and Other Intangible Assets - Intangibles (Details) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
	Feb. 25, 2022	Aug. 27, 2022	Feb. 26, 2022
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 1,743,393	$ 1,743,805
Total Accumulated Amortization, Finite		(1,489,753)	(1,467,009)
Total Net, finite		253,640	276,796
Gross Carrying Amount, Total		1,757,793	1,758,205
Net, Total		268,040	291,196
Trademarks
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Total Accumulated Amortization, Indefinite Lived
Net Carrying Amount, Indefinite Lived		14,400	14,400
Gross Carrying Amount, Indefinite Lived		14,400	14,400
Noncompete agreements and other
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		200,066	197,651
Total Accumulated Amortization, Finite		(180,856)	(178,958)
Total Net, finite		$ 19,210	$ 18,693
Remaining Weighted Average Amortization Period		3 years	3 years
Prescription files
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 1,027,342	$ 1,030,169
Total Accumulated Amortization, Finite		(922,094)	(918,773)
Total Net, finite		$ 105,248	$ 111,396
Remaining Weighted Average Amortization Period		5 years	6 years
Customer relationships
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 388,000	$ 388,000
Total Accumulated Amortization, Finite		(296,733)	(286,090)
Total Net, finite		$ 91,267	$ 101,910
Remaining Weighted Average Amortization Period		9 years	10 years
CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 57,500	$ 57,500
Total Accumulated Amortization, Finite		(19,585)	(15,372)
Total Net, finite		$ 37,915	$ 42,128
Remaining Weighted Average Amortization Period		4 years	5 years
Claims adjudication and other developed software
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 58,985	$ 58,985
Total Accumulated Amortization, Finite		$ (58,985)	(56,316)
Total Net, finite			$ 2,669
Remaining Weighted Average Amortization Period		0 years	1 year
Backlog
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Gross Carrying Amount, Finite		$ 11,500	$ 11,500
Total Accumulated Amortization, Finite		(11,500)	(11,500)
Total Net, finite
Remaining Weighted Average Amortization Period		0 years	0 years
EI (Elixir Insurance) | CMS license
Finite Lived And Indefinite Lived Intangible Assets By Major Class
Remaining Weighted Average Amortization Period	19 years		5 years