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Related parties (Details) - USD ($) $ in Millions				12 Months Ended
Related parties (Details) - USD ($) $ in Millions	Aug. 31, 2022	Dec. 28, 2021	Nov. 24, 2021	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Affiliated Entity \| UMass Memorial Medical Center And UMass Memorial Accountable Care Organization
Related Party Transaction [Line Items]
Revenue from related parties				$ 67.0
Affiliated Entity \| AmerisourceBergen
Related Party Transaction [Line Items]
Purchases, net				62,174.0	$ 62,513.0	$ 59,569.0
Trade accounts payable, net of Trade accounts receivable	$ 6,915.0			$ 6,915.0	$ 6,589.0	$ 6,390.0
VillageMD
Related Party Transaction [Line Items]
Business acquisition, value of common stock shares acquired			$ 1,900.0
VillageMD \| Affiliated Entity
Related Party Transaction [Line Items]
Business acquisition, value of common stock shares acquired		$ 1,900.0
Payments for stock consideration		$ 117.0
Number of shares tendered (in shares)		287,781,000,000
VillageMD \| Affiliated Entity \| Steve Shulman \| VillageMD
Related Party Transaction [Line Items]
Percentage of outstanding shares owned		1.20%
CareCentrix, Inc. \| Affiliated Entity
Related Party Transaction [Line Items]
Payments for stock consideration	$ 15.4
CareCentrix, Inc. \| Affiliated Entity \| Steve Shulman \| NDES Holdings
Related Party Transaction [Line Items]
Percentage of outstanding shares owned	5.30%			5.30%