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Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2018 | May 31, 2017 | Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues | $ 8,583,982 | $ 9,087,328 | $ 6,980,153 | $ 8,031,884 | $ 7,996,339 | $ 8,638,410 | $ 7,400,773 | $ 8,001,904 | $ 15,012,037 | $ 15,402,677 | $ 24,099,365 | $ 24,041,087 | $ 32,683,347 | $ 32,037,426 | $ 30,355,260
Operating earnings (loss) | 223,836 | 88,199 | (40,063) | 185,114 | (92,780) | (260,980) | 2,969 | 176,765 | 145,051 | 179,734 | 233,250 | (81,246) | 457,086 | (174,026) | 292,443
(Gain) loss on disposal of business | (61) | (124,050) | (7,705) | 0 | 704 | (1,224) | (1,395) | 4,105 | (7,705) | 2,710 | (131,755) | 1,486 | (131,816) | 2,190 | 0
Interest expense | 18,984 | 49,340 | 40,176 | 40,702 | 53,828 | 39,201 | 39,945 | 38,265 | 80,878 | 78,210 | 130,218 | 117,411 | 149,202 | 171,239 | 113,704
Other (income) loss | (27,015) | (14,622) | (11,364) | (25,014) | (25,407) | (11,952) | (18,083) | (44,509) | (36,378) | (62,592) | (51,000) | (74,544) | (78,015) | (99,951) | (47,609)
Equity (income) loss from investments | (16,404) | (59,308) | (39,441) | (38,362) | (12,817) | (48,393) | (35,800) | (40,328) | (77,803) | (76,128) | (137,111) | (124,521) | (153,515) | (137,338) | (175,777)
Income (loss) before income taxes | 248,332 | 236,839 | (21,729) | 207,788 | (109,088) | (238,612) | 18,302 | 219,232 | 186,059 | 237,534 | 422,898 | (1,078) | 671,230 | (110,166) | 402,125
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 355,412 | 444,397 | 692,780
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 478,050 | 480,223 | 447,492
Total assets | 16,381,178 | $ 16,703,549 | $ 17,003,396 | $ 16,647,718 | 15,818,922 | $ 17,081,380 | $ 18,459,230 | $ 18,275,540 | $ 17,003,396 | $ 18,459,230 | $ 16,703,549 | $ 17,081,380 | 16,381,178 | 15,818,922 |
Operating Segments | Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 8,068,717 | 6,620,680 | 5,743,882
Operating earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 390,092 | 75,138 | 246,105
(Gain) loss on disposal of business |  |  |  |  |  |  |  |  |  |  |  |  | (65,862) | 0 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 14,627 | 18,365 | (22,244)
Other (income) loss |  |  |  |  |  |  |  |  |  |  |  |  | (7,718) | (1,164) | (287)
Equity (income) loss from investments |  |  |  |  |  |  |  |  |  |  |  |  | (3,063) | (3,181) | (4,739)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 452,108 | 61,118 | 273,375
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | (479,598) | (392,842) | (335,003)
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 248,207 | 260,543 | 376,841
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 230,230 | 223,229 | 193,525
Total assets | 4,168,239 |  |  |  | 4,290,618 |  |  |  |  |  |  |  | 4,168,239 | 4,290,618 |
Operating Segments | Ag |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 25,052,395 | 25,738,740 | 24,896,354
Operating earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 95,883 | (268,946) | 36,649
(Gain) loss on disposal of business |  |  |  |  |  |  |  |  |  |  |  |  | (7,707) | 2,190 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 94,256 | 71,986 | 82,085
Other (income) loss |  |  |  |  |  |  |  |  |  |  |  |  | (66,316) | (65,684) | (53,044)
Equity (income) loss from investments |  |  |  |  |  |  |  |  |  |  |  |  | 1,392 | (7,277) | (7,644)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 74,258 | (270,161) | 15,252
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | (14,914) | (20,312) | (40,336)
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 77,962 | 146,139 | 260,865
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 218,716 | 232,443 | 230,172
Total assets | 6,534,777 |  |  |  | 6,359,058 |  |  |  |  |  |  |  | 6,534,777 | 6,359,058 |
Operating Segments | Nitrogen Production |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (20,619) | (18,430) | (6,193)
(Gain) loss on disposal of business |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 50,499 | 48,893 | 34,437
Other (income) loss |  |  |  |  |  |  |  |  |  |  |  |  | (3,061) | (30,534) | 0
Equity (income) loss from investments |  |  |  |  |  |  |  |  |  |  |  |  | (106,895) | (66,530) | (74,700)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 38,838 | 29,741 | 34,070
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total assets | 2,758,668 |  |  |  | 2,781,610 |  |  |  |  |  |  |  | 2,758,668 | 2,781,610 |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 64,516 | 95,414 | 92,725
Operating earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (8,270) | 38,212 | 15,882
(Gain) loss on disposal of business |  |  |  |  |  |  |  |  |  |  |  |  | (58,247) | 0 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (7,712) | 33,250 | 30,647
Other (income) loss |  |  |  |  |  |  |  |  |  |  |  |  | (3,388) | (3,824) | (5,499)
Equity (income) loss from investments |  |  |  |  |  |  |  |  |  |  |  |  | (44,949) | (60,350) | (88,694)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 106,026 | 69,136 | 79,428
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | (7,769) | (4,254) | (2,362)
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 29,243 | 37,715 | 55,074
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 29,104 | 24,551 | 23,795
Total assets | 2,919,494 |  |  |  | 2,387,636 |  |  |  |  |  |  |  | 2,919,494 | 2,387,636 |
Reconciling Amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, including intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | (502,281) | (417,408) | (377,701)
Operating earnings (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
(Gain) loss on disposal of business |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (2,468) | (1,255) | (11,221)
Other (income) loss |  |  |  |  |  |  |  |  |  |  |  |  | 2,468 | 1,255 | 11,221
Equity (income) loss from investments |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  | 502,281 | 417,408 | 377,701
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Total assets | $ 0 |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 0 | $ 0 |

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