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Equities Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | $ 7,905,825 | $ 7,866,250 | $ 7,669,411 | $ 6,466,844
Other comprehensive income (loss), net of tax | 28,056 | 2,481 | (57,450) |
Pension and Other Postretirement Benefits |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (135,046) | (165,146) | (171,729) | (151,852)
Amounts before reclassifications | 25,216 | (10,512) | (54,284) |
Amounts reclassified out | 23,572 | 20,998 | 21,681 |
Total other comprehensive income (loss), before tax | 48,788 | 10,486 | (32,603) |
Tax effect | (18,688) | (3,903) | 12,726 |
Other comprehensive income (loss), net of tax | 30,100 | 6,583 | (19,877) |
Unrealized Net Gain (Loss) on Available for Sale Investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | 10,041 | 5,656 | 4,156 | 4,398
Amounts before reclassifications | 7,117 | 2,447 | (396) |
Amounts reclassified out | 0 | 0 | 0 |
Total other comprehensive income (loss), before tax | 7,117 | 2,447 | (396) |
Tax effect | (2,732) | (947) | 154 |
Other comprehensive income (loss), net of tax | 4,385 | 1,500 | (242) |
Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (6,954) | (9,196) | (5,324) | (2,722)
Amounts before reclassifications | 1,892 | (11,353) | (5,001) |
Amounts reclassified out | 1,742 | 5,071 | 792 |
Total other comprehensive income (loss), before tax | 3,634 | (6,282) | (4,209) |
Tax effect | (1,392) | 2,410 | 1,607 |
Other comprehensive income (loss), net of tax | 2,242 | (3,872) | (2,602) |
Foreign Currency Translation Adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (51,711) | (43,040) | (41,310) | (6,581)
Amounts before reclassifications | (8,472) | (1,036) | (30,672) |
Amounts reclassified out | 15 | 469 | 0 |
Total other comprehensive income (loss), before tax | (8,457) | (567) | (30,672) |
Tax effect | (214) | (1,163) | (4,057) |
Other comprehensive income (loss), net of tax | (8,671) | (1,730) | (34,729) |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance | (183,670) | (211,726) | (214,207) | $ (156,757)
Amounts before reclassifications | 25,753 | (20,454) | (90,353) |
Amounts reclassified out | 25,329 | 26,538 | 22,473 |
Total other comprehensive income (loss), before tax | 51,082 | 6,084 | (67,880) |
Tax effect | (23,026) | (3,603) | 10,430 |
Other comprehensive income (loss), net of tax | $ 28,056 | $ 2,481 | $ (57,450) |

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