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Equities - Accumulated Other Comprehensive Loss (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
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | $ 7,920,836 | $ 7,866,357 | $ 7,742,948 | $ 7,705,640 | $ 7,680,371 | $ 7,808,580 | $ 7,819,516 | $ 7,759,159 | $ 7,705,640 | $ 7,759,159 | $ 7,705,640 | $ 7,759,159 | $ 7,705,640 | $ 7,759,159 | $ 7,551,439
Other comprehensive income (loss), net of tax | (5,621) | (72) | 10,111 | 3,019 | 28,208 | 2,524 | 13,843 | (13,405) | 13,130 | 438 | 13,058 | 2,962 | 7,437 | 31,170 | 1,307
Reclassification of tax effects to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Balance | 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
Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (132,444) |  |  |  | (165,146) | (132,444) | (165,146) | (132,444) | (165,146) | (132,444) | (165,146) | (171,729)
Amounts before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 7,633 | 25,216 | (10,512)
Amounts reclassified out |  |  |  |  |  |  |  |  |  |  |  |  | 21,804 | 26,174 | 20,998
Total other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  |  |  |  |  | 29,437 | 51,390 | 10,486
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | (9,371) | (18,688) | (3,903)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 20,066 | 32,702 | 6,583
Reclassification of tax effects to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | (27,957) |  |
Balance | (140,335) |  |  |  | (132,444) |  |  |  |  |  |  |  | (140,335) | (132,444) | (165,146)
Unrealized Net Gain (Loss) on Available for Sale Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 10,041 |  |  |  | 5,656 | 10,041 | 5,656 | 10,041 | 5,656 | 10,041 | 5,656 | 4,156
Amounts before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 21,078 | 7,117 | 2,447
Amounts reclassified out |  |  |  |  |  |  |  |  |  |  |  |  | (25,534) | 0 | 0
Total other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  |  |  |  |  | (4,456) | 7,117 | 2,447
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | 1,308 | (2,732) | (947)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (3,148) | 4,385 | 1,500
Reclassification of tax effects to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | 1,968 |  |
Balance | 8,861 |  |  |  | 10,041 |  |  |  |  |  |  |  | 8,861 | 10,041 | 5,656
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (6,954) |  |  |  | (9,196) | (6,954) | (9,196) | (6,954) | (9,196) | (6,954) | (9,196) | (5,324)
Amounts before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 1,031 | 1,892 | (11,353)
Amounts reclassified out |  |  |  |  |  |  |  |  |  |  |  |  | 1,704 | 1,742 | 5,071
Total other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  |  |  |  |  | 2,735 | 3,634 | (6,282)
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | (195) | (1,392) | 2,410
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 2,540 | 2,242 | (3,872)
Reclassification of tax effects to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | (1,468) |  |
Balance | (5,882) |  |  |  | (6,954) |  |  |  |  |  |  |  | (5,882) | (6,954) | (9,196)
Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (51,003) |  |  |  | (42,844) | (51,003) | (42,844) | (51,003) | (42,844) | (51,003) | (42,844) | (39,940)
Amounts before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | (10,062) | (7,960) | (2,210)
Amounts reclassified out |  |  |  |  |  |  |  |  |  |  |  |  | (2,042) | 15 | 469
Total other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  |  |  |  |  | (12,104) | (7,945) | (1,741)
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | 83 | (214) | (1,163)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | (12,021) | (8,159) | (2,904)
Reclassification of tax effects to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | 465 |  |
Balance | (62,559) |  |  |  | (51,003) |  |  |  |  |  |  |  | (62,559) | (51,003) | (42,844)
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (180,360) |  |  |  | (211,530) | (180,360) | (211,530) | (180,360) | (211,530) | (180,360) | (211,530) | (212,837)
Amounts before reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 19,680 | 26,265 | (21,628)
Amounts reclassified out |  |  |  |  |  |  |  |  |  |  |  |  | (4,068) | 27,931 | 26,538
Total other comprehensive income (loss), before tax |  |  |  |  |  |  |  |  |  |  |  |  | 15,612 | 54,196 | 4,910
Tax effect |  |  |  |  |  |  |  |  |  |  |  |  | (8,175) | (23,026) | (3,603)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 7,437 | 31,170 | 1,307
Reclassification of tax effects to retained earnings | (27,000) |  |  |  |  |  |  |  |  |  |  |  | (26,992) |  |
Balance | (199,915) |  |  |  | (180,360) |  |  |  |  |  |  |  | (199,915) | (180,360) | (211,530)
As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 8,162,533 | 8,061,960 | 7,937,775 | 7,905,825 | 7,858,956 | 7,961,594 | 7,931,280 | 7,866,250 | 7,905,825 | 7,866,250 | 7,905,825 | 7,866,250 | 7,905,825 | 7,866,250 | 7,669,411
Other comprehensive income (loss), net of tax |  | (1,501) | 10,219 | 5,225 | 26,030 | 1,742 | 14,778 | (14,494) | 15,445 | 284 | 13,944 | 2,026 |  | 28,056 | 2,481
Balance |  | 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
As Previously Reported | Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (171,729)
As Previously Reported | Unrealized Net Gain (Loss) on Available for Sale Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,156
As Previously Reported | Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,324)
As Previously Reported | Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41,310)
As Previously Reported | Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (183,670) |  |  |  | (211,726) | (183,670) | (211,726) | (183,670) | (211,726) | (183,670) | (211,726) | (214,207)
Balance |  |  |  |  | (183,670) |  |  |  |  |  |  |  |  | (183,670) | (211,726)
Restatement Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | $ (241,697) | (195,603) | (194,827) | (200,185) | (178,585) | (153,014) | (111,764) | (107,091) | (200,185) | (107,091) | (200,185) | (107,091) | (200,185) | (107,091) | (117,972)
Other comprehensive income (loss), net of tax |  | 1,429 | (108) | (2,206) | 2,178 | 782 | (935) | 1,089 | (2,315) | 154 | (886) | 936 |  | 3,114 | (1,174)
Balance |  | $ (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)
Restatement Adjustments | Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Restatement Adjustments | Unrealized Net Gain (Loss) on Available for Sale Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Restatement Adjustments | Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Restatement Adjustments | Foreign Currency Translation Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,370
Restatement Adjustments | Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 3,310 |  |  |  | $ 196 | $ 3,310 | $ 196 | $ 3,310 | $ 196 | $ 3,310 | 196 | 1,370
Balance |  |  |  |  | $ 3,310 |  |  |  |  |  |  |  |  | $ 3,310 | $ 196

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