CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Income Statement [Abstract]
Net sales	$ 2,018,003	$ 2,008,888	$ 4,245,316	$ 3,990,689
Costs and operating expenses (income):
Cost of goods sold	1,621,763	1,614,965	3,341,177	3,201,375
Selling, general and administrative expenses	150,427	127,985	306,550	251,563
Interest expense	9,945	12,011	22,990	23,046
Asset impairments	36	1,228	45	1,228
Loss on debt extinguishment	(27)	(16,052)	(178)	(16,052)
Loss (gain) on sale of assets	315	(273,099)	387	(274,082)
Costs and operating expenses	1,782,513	1,499,142	3,671,327	3,219,182
Earnings before income taxes	235,490	509,746	573,989	771,507
Income taxes	55,641	126,432	132,366	155,304
Net earnings	$ 179,849	$ 383,314	$ 441,623	$ 616,203
Earnings per share:
Basic (in USD per share)	$ 1.53	$ 3.16	$ 3.77	$ 5.08
Diluted (in USD per share)	$ 1.51	$ 3.12	$ 3.71	$ 5.02
Average basic shares outstanding (shares)	117,224,517	121,458,196	117,249,266	121,293,030
Average diluted shares outstanding (shares)	118,723,259	122,852,410	118,985,098	122,747,981