Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	$ 35,462,608	$ 39,261,229	$ 45,590,004
Intersegment Revenue	0	0	0
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	35,462,608	39,261,229	45,590,004
Cost of goods sold	34,325,794	37,509,902	43,213,739
Marketing, general and administrative expenses	1,046,059	1,166,969	1,032,765
Interest expense	146,079	104,064	137,442
Other income	(100,431)	(137,630)	(112,131)
Equity income from investments	(569,665)	(479,863)	(689,590)
(Loss) income before income taxes	614,772	1,097,787	2,007,779
Segment, Expenditure, Addition to Long-Lived Assets	999,955	831,511	781,935
Depreciation and amortization, including amortization of deferred major maintenance	651,426	569,891	539,521
Nitrogen Production | Operating Segments
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	0	0	0
Intersegment Revenue	0	0	0
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	0	0	0
Cost of goods sold	1,673	138	1,693
Marketing, general and administrative expenses	68,290	71,392	72,135
Interest expense	69,094	61,942	60,090
Other income	(3,654)	(9,176)	0
Equity income from investments	(294,944)	(275,531)	(394,678)
(Loss) income before income taxes	159,541	151,235	260,760
Segment, Expenditure, Addition to Long-Lived Assets	0	0	0
Depreciation and amortization, including amortization of deferred major maintenance	0	0	0
Ag | Operating Segments
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	27,755,290	30,432,758	35,456,969
Intersegment Revenue	(6,809)	(15,899)	(31,765)
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	27,748,481	30,416,859	35,425,204
Cost of goods sold	26,985,759	29,478,231	34,501,163
Marketing, general and administrative expenses	602,104	697,301	577,904
Interest expense	94,580	61,982	71,115
Other income	(90,460)	(98,142)	(88,061)
Equity income from investments	(89,162)	(65,190)	(48,725)
(Loss) income before income taxes	245,660	342,677	411,808
Segment, Expenditure, Addition to Long-Lived Assets	336,328	426,291	308,690
Depreciation and amortization, including amortization of deferred major maintenance	243,098	178,400	166,982
Energy | Operating Segments
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	8,035,160	9,339,079	10,761,503
Intersegment Revenue	(400,127)	(572,584)	(664,590)
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	7,635,033	8,766,495	10,096,913
Cost of goods sold	7,339,336	8,041,588	8,718,224
Marketing, general and administrative expenses	313,402	321,053	307,197
Interest expense	(6,103)	(16,773)	7,672
Other income	(4,968)	(11,283)	(19,456)
Equity income from investments	408	2,857	7,833
(Loss) income before income taxes	(7,042)	429,053	1,075,443
Segment, Expenditure, Addition to Long-Lived Assets	533,570	226,899	421,416
Depreciation and amortization, including amortization of deferred major maintenance	352,348	343,962	329,021
Corporate and Other
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	87,915	94,113	82,107
Intersegment Revenue	(8,821)	(16,238)	(14,220)
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	79,094	77,875	67,887
Cost of goods sold	(974)	(10,055)	(7,341)
Marketing, general and administrative expenses	62,263	77,223	75,529
Interest expense	17,278	22,027	31,487
Other income	(30,119)	(44,143)	(37,536)
Equity income from investments	(185,967)	(141,999)	(254,020)
(Loss) income before income taxes	216,613	174,822	259,768
Segment, Expenditure, Addition to Long-Lived Assets	130,057	178,321	51,829
Depreciation and amortization, including amortization of deferred major maintenance	55,980	47,529	43,518
Other Segments
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	(415,757)	(604,721)	(710,575)
Intersegment Revenue	415,757	604,721	710,575
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	0	0	0
Cost of goods sold	0	0	0
Marketing, general and administrative expenses	0	0	0
Interest expense	(28,770)	(25,114)	(32,922)
Other income	28,770	25,114	32,922
Equity income from investments	0	0	0
(Loss) income before income taxes	0	0	0
Segment, Expenditure, Addition to Long-Lived Assets	0	0	0
Depreciation and amortization, including amortization of deferred major maintenance	0	0	0
Reportable Segment, Aggregation before Other Operating Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenue From Contract With Customer, Including Intersegment Revenue, Excluding Assessed Tax	35,790,450	39,771,837	46,218,472
Intersegment Revenue	(406,936)	(588,483)	(696,355)
RevenueFromContractWithCustomerNetofIntersegmentRevenueExcludingAssessedTax	35,383,514	39,183,354	45,522,117
Cost of goods sold	34,326,768	37,519,957	43,221,080
Marketing, general and administrative expenses	983,796	1,089,746	957,236
Interest expense	157,571	107,151	138,877
Other income	(99,082)	(118,601)	(107,517)
Equity income from investments	(383,698)	(337,864)	(435,570)
(Loss) income before income taxes	398,159	922,965	1,748,011
Segment, Expenditure, Addition to Long-Lived Assets	869,898	653,190	730,106
Depreciation and amortization, including amortization of deferred major maintenance	$ 595,446	$ 522,362	$ 496,003