The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2026	Aug. 31, 2025	Aug. 31, 2024
Property, Plant, and Equipment [Line Items]
Depreciation expense	$ 548.1	$ 546.6	$ 474.8
Superior Wisconsin
Property, Plant, and Equipment [Line Items]
Depreciation expense		$ 21.4
Land improvements \| Minimum
Property, Plant, and Equipment [Line Items]
Useful life of assets	15 years
Land improvements \| Maximum
Property, Plant, and Equipment [Line Items]
Useful life of assets	20 years
Buildings \| Minimum
Property, Plant, and Equipment [Line Items]
Useful life of assets	20 years
Buildings \| Maximum
Property, Plant, and Equipment [Line Items]
Useful life of assets	40 years
Machinery and equipment \| Minimum
Property, Plant, and Equipment [Line Items]
Useful life of assets	5 years
Machinery and equipment \| Maximum
Property, Plant, and Equipment [Line Items]
Useful life of assets	20 years
Computer software, office equipment and other \| Minimum
Property, Plant, and Equipment [Line Items]
Useful life of assets	3 years
Computer software, office equipment and other \| Maximum
Property, Plant, and Equipment [Line Items]
Useful life of assets	10 years