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Equities - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | $ 8,165,028 | $ 7,705,640 | $ 7,759,159
Other comprehensive income (loss), net of tax | (22,312) | 7,437 | 31,170
Reclassification of tax effects to capital reserves | 0 |  |
Balance | 8,617,530 | 8,165,028 | 7,705,640
Pension and Other Postretirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (51,118) | 7,633 | 25,216
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 10,279 | 21,804 | 26,174
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | (140,335) | (132,444) | (165,146)
Total other comprehensive income (loss), before tax | (40,839) | 29,437 | 51,390
Tax effect | 8,280 | (9,371) | (18,688)
Other comprehensive income (loss), net of tax | (32,559) | 20,066 | 32,702
Reclassification of tax effects to capital reserves | 416 | (27,957) |
Balance | (172,478) | (140,335) | (132,444)
Unrealized Net Gain (Loss) on Available for Sale Investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 0 | 21,078 | 7,117
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | (25,534) | 0
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | 8,861 | 10,041 | 5,656
Total other comprehensive income (loss), before tax | 0 | (4,456) | 7,117
Tax effect | 0 | 1,308 | (2,732)
Other comprehensive income (loss), net of tax | 0 | (3,148) | 4,385
Reclassification of tax effects to capital reserves | (8,861) | 1,968 |
Balance | 0 | 8,861 | 10,041
Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 37,709 | 1,031 | 1,892
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (9,843) | 1,704 | 1,742
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | (5,882) | (6,954) | (9,196)
Total other comprehensive income (loss), before tax | 27,866 | 2,735 | 3,634
Tax effect | (7,670) | (195) | (1,392)
Other comprehensive income (loss), net of tax | 20,196 | 2,540 | 2,242
Reclassification of tax effects to capital reserves | 983 | (1,468) |
Balance | 15,297 | (5,882) | (6,954)
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (9,990) | (10,062) | (7,960)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | (2,042) | 15
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | (62,559) | (51,003) | (42,844)
Total other comprehensive income (loss), before tax | (9,990) | (12,104) | (7,945)
Tax effect | 41 | 83 | (214)
Other comprehensive income (loss), net of tax | (9,949) | (12,021) | (8,159)
Reclassification of tax effects to capital reserves | 2,756 | 465 |
Balance | (69,752) | (62,559) | (51,003)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (23,399) | 19,680 | 26,265
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 436 | (4,068) | 27,931
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | (199,915) | (180,360) | (211,530)
Total other comprehensive income (loss), before tax | (22,963) | 15,612 | 54,196
Tax effect | 651 | (8,175) | (23,026)
Other comprehensive income (loss), net of tax | (22,312) | 7,437 | 31,170
Reclassification of tax effects to capital reserves | (4,706) | (26,992) |
Balance | $ (226,933) | $ (199,915) | $ (180,360)

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