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Restatement of Previously Issued Consolidated Financial Statements - Summary of Impacts of the Restatement Adjustments on Previously Reported Consolidated Capital Reserves and Total Equities (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 | Aug. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital reserves | $ 1,482,003 | $ 1,559,040 | $ 1,450,326 | $ 1,324,372 | $ 1,267,808 | $ 1,397,834 | $ 1,560,498 | $ 1,592,434 | $ 1,450,326 | $ 1,560,498 | $ 1,559,040 | $ 1,397,834 | $ 1,482,003 | $ 1,267,808 |  | $ 1,485,433
Stockholders' equity | 8,165,028 | 7,920,836 | 7,866,357 | 7,742,948 | 7,705,640 | 7,680,371 | 7,808,580 | 7,819,516 | 7,866,357 | 7,808,580 | 7,920,836 | 7,680,371 | 8,165,028 | 7,705,640 | $ 7,759,159 | 7,551,439
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 |
Net income (loss) | $ 240,545 | 181,620 | 165,959 | 187,182 | (74,327) | (72,488) | 14,617 | 203,156 | 353,141 | 217,773 | 534,761 | 145,285 | $ 775,306 | 70,958 | 383,026 |
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital reserves |  | 1,803,078 | 1,646,837 | 1,520,218 | 1,471,217 | 1,577,469 | 1,713,784 | 1,691,603 | 1,646,837 | 1,713,784 | 1,803,078 | 1,577,469 |  | 1,471,217 |  | 1,604,670
Stockholders' equity |  | 8,162,533 | 8,061,960 | 7,937,775 | 7,905,825 | 7,858,956 | 7,961,594 | 7,931,280 | 8,061,960 | 7,961,594 | 8,162,533 | 7,858,956 |  | 7,905,825 | 7,866,250 | 7,669,411
Income (loss) before income taxes |  | 289,484 | (14,550) | 199,555 | (94,845) | (209,158) | 23,597 | 225,554 | 185,005 | 249,151 | 474,490 | 39,994 |  | (54,852) | 419,878 |
Net income (loss) |  | 229,146 | 166,626 | 179,619 | (50,552) | (46,140) | 14,973 | 208,942 | 346,245 | 223,915 | 575,391 | 177,775 |  | 127,223 | 423,969 |
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital reserves |  | (244,038) | (196,511) | (195,846) | (203,409) | (179,635) | (153,286) | (99,169) | (196,511) | (153,286) | (244,038) | (179,635) |  | (203,409) |  | (119,237)
Stockholders' equity |  | (241,697) | (195,603) | (194,827) | (200,185) | (178,585) | (153,014) | (111,764) | (195,603) | (153,014) | (241,697) | (178,585) |  | (200,185) | (107,091) | $ (117,972)
Income (loss) before income taxes |  | (52,645) | (7,179) | 8,233 | (14,243) | (29,454) | (5,295) | (6,322) | 1,054 | (11,617) | (51,592) | (41,072) |  | (55,314) | (17,753) |
Net income (loss) |  | $ (47,526) | $ (667) | $ 7,563 | $ (23,775) | $ (26,348) | $ (356) | $ (5,786) | $ 6,896 | $ (6,142) | $ (40,630) | $ (32,490) |  | $ (56,265) | $ (40,943) |

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