Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Sep. 01, 2019	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 172,404		$ 172,404
Customer lists, trademarks and other intangible assets	65,025		71,206
Notes receivable	109,145		189,045
Long-term derivative assets	21,157		36,408
Prepaid pension and other benefits	106,209		73,100
Capitalized major maintenance	228,511		286,890	$ 130,780	$ 105,006
Cash value life insurance	130,673		122,792
Operating Lease, Right-of-Use Asset	257,834	$ 268,400
Other	48,471		60,350
Other assets	1,139,429		1,012,195
Change in Goodwill	0
Customer lists, trademarks and other intangible assets
Finite-Lived Intangible Assets [Line Items]
Customer lists, trademarks and other intangible assets	$ 65,025		$ 71,206