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Description of Business and Summary of Significant Accounting Policies (Change in AOCI, Net of Tax) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | $ 1,963,380 | $ 2,368,344 | $ 2,457,497
Other comprehensive (loss) income before reclassifications | (117,684) |  |
Amounts reclassified from AOCI | 54,289 |  |
Total other comprehensive (loss) income | (63,395) | (74,019) | 94,497
Ending Balance | 1,900,758 | 1,963,380 | 2,368,344
Foreign Currency Translation Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 7,431 |  |
Other comprehensive (loss) income before reclassifications | (21,729) |  |
Amounts reclassified from AOCI | 0 |  |
Total other comprehensive (loss) income | (21,729) |  |
Ending Balance | (14,298) | 7,431 |
Derivative Instruments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 8,116 |  |
Other comprehensive (loss) income before reclassifications | (67,773) |  |
Amounts reclassified from AOCI | 20,259 |  |
Total other comprehensive (loss) income | (47,514) |  |
Ending Balance | (39,398) | 8,116 |
Actuarial (Loss) Gain |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (25,021) |  |
Other comprehensive (loss) income before reclassifications | (3,753) |  |
Amounts reclassified from AOCI | 741 |  |
Total other comprehensive (loss) income | (3,012) |  |
Ending Balance | (28,033) | (25,021) |
Prior Service (Cost) Credit |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (643) |  |
Other comprehensive (loss) income before reclassifications | 79 |  |
Amounts reclassified from AOCI | (44) |  |
Total other comprehensive (loss) income | 35 |  |
Ending Balance | (608) | (643) |
Available for Sale Securities |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (9,282) |  |
Other comprehensive (loss) income before reclassifications | (24,508) |  |
Amounts reclassified from AOCI | 33,333 |  |
Total other comprehensive (loss) income | 8,825 |  |
Ending Balance | (457) | (9,282) |
AOCI Attributable to Parent |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (19,399) | 54,620 | (39,877)
Ending Balance | $ (82,794) | $ (19,399) | $ 54,620

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