Concentration of Risk and Segment Data - Schedule of Segment Income and Reconciliation of Income Before Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2024
Segment Reporting [Line Items]
Segment income	$ 1,704	$ 1,182	$ 2,013
Reconciling items:
Amortization of intangibles	(89)	(62)	(40)
Stock-based compensation expense and related charges	(140)	(107)	(89)
Restructuring, severance and related charges	(97)	(181)	(296)
(Loss) gain from the divestiture of businesses	(1)	(53)	942
Acquisition and divestiture related charges	(34)	(20)	(70)
Loss on securities	0	(46)	0
Interest expense, net	(181)	(147)	(173)
Income before income tax	1,408	892	1,751
Hanley Energy Group | Forward Contracts | Foreign Exchange
Reconciling items:
Gains on forward foreign exchange contracts	8
Disposed of Sale | Divested Operations in Italy | Jabil Circuit Italia S.r.l (JCI)
Reconciling items:
(Loss) gain from the divestiture of businesses		(97)
Held for Sale | Product Manufacturing Business
Reconciling items:
(Loss) gain from the divestiture of businesses		54	942
Operating Segments
Segment Reporting [Line Items]
Segment income	2,069	1,620	1,588
Segment Reconciling Items
Reconciling items:
Amortization of intangibles	(89)	(62)	(40)
Stock-based compensation expense and related charges	(140)	(107)	(89)
Restructuring, severance and related charges	(97)	(181)	(296)
Business interruption and impairment charges, net	0	(8)	(16)
(Loss) gain from the divestiture of businesses	(1)	(53)	942
Acquisition and divestiture related charges	(34)	(20)	(70)
Loss on securities	0	(46)	0
Other expense (net of periodic benefit cost)	(119)	(104)	(95)
Interest expense, net	$ (181)	$ (147)	$ (173)