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Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings from Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Segment Reporting Information [Line Items]
Earnings from operations	$ 360.1	$ 324.5	$ 176.4
Interest and foreign exchange	75.7	100.8	85.4
Earnings before income tax and earnings from unconsolidated affiliates	284.4	223.7	91.0
Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations	488.1	447.7	281.1
Corporate
Segment Reporting Information [Line Items]
Earnings from operations	128.0	123.2	104.7
Manufacturing | Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations	327.5	308.7	177.8
Leasing & Fleet Management | Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations	$ 160.6	$ 139.0	$ 103.3

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