CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Income Statement [Abstract]
Net sales	$ 2,515,727	$ 1,845,041	$ 6,506,416	$ 4,699,114
Costs and operating expenses (income):
Cost of goods sold	1,956,459	1,533,768	5,157,834	3,936,930
Selling, general and administrative expenses	139,556	134,357	391,119	368,882
Interest expense	13,433	11,965	36,479	40,245
Loss on debt extinguishment	(39)	0	(16,091)	(16,841)
Asset impairments	3,245	277	4,473	4,345
Gain on sale of assets	(2,024)	(3,909)	(276,106)	(9,390)
Net costs and operating expenses	2,110,708	1,676,458	5,329,890	4,357,853
Earnings before income taxes	405,019	168,583	1,176,526	341,261
Income taxes	92,590	38,175	247,894	80,709
Net earnings	$ 312,429	$ 130,408	$ 928,632	$ 260,552
Earnings per share:
Basic (in USD per share)	$ 2.58	$ 1.08	$ 7.66	$ 2.17
Diluted (in USD per share)	$ 2.54	$ 1.07	$ 7.55	$ 2.14
Average basic shares outstanding (shares)	121,247,105	120,613,652	121,277,553	120,241,579
Average diluted shares outstanding (shares)	122,799,869	122,193,655	122,927,291	121,852,144