Other Assets - Narrative (Details) - USD ($)		12 Months Ended
	Jul. 31, 2022	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Goodwill [Line Items]
Goodwill		$ 179,976,000	$ 171,601,000	$ 172,404,000
Goodwill impairment, result of annual impairment analysis	$ 0
Amortization of intangible assets		6,800,000	6,900,000	7,300,000
Ag
Goodwill [Line Items]
Goodwill		159,944,000	$ 160,475,000	$ 161,278,000
Nitrogen Production
Goodwill [Line Items]
Goodwill		$ 0
Minimum | Other Intangible Assets
Goodwill [Line Items]
Intangible asset useful lives		2 years
Maximum | Other Intangible Assets
Goodwill [Line Items]
Intangible asset useful lives		30 years