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Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | $ 54,620 | $ (39,877) |
Other comprehensive (loss) income before reclassifications | (51,982) | 67,871 |
Amounts reclassified from AOCI | (22,037) | 26,626 |
Total other comprehensive (loss) income | (74,019) | 94,497 | $ 10,977
Balance as of end of period | (19,399) | 54,620 | (39,877)
Amount expected to be reclassified during the next 12 months | 9,000 |  |
Foreign Currency Translation Adjustment |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | 57,582 | 16,338 |
Other comprehensive (loss) income before reclassifications | (50,151) | 35,297 |
Amounts reclassified from AOCI | 0 | 5,947 |
Total other comprehensive (loss) income | (50,151) | 41,244 |
Balance as of end of period | 7,431 | 57,582 | 16,338
Derivative Instruments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | 29,967 | 7,784 |
Other comprehensive (loss) income before reclassifications | 1,225 | 13,434 |
Amounts reclassified from AOCI | (23,076) | 8,749 |
Total other comprehensive (loss) income | (21,851) | 22,183 |
Balance as of end of period | 8,116 | 29,967 | 7,784
Derivative Instruments | Income Tax Expense |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Amounts reclassified from AOCI | (14,800) |  |
Actuarial (Loss) Gain |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | (33,215) | (43,587) |
Other comprehensive (loss) income before reclassifications | 7,067 | 8,443 |
Amounts reclassified from AOCI | 1,127 | 1,929 |
Total other comprehensive (loss) income | 8,194 | 10,372 |
Balance as of end of period | (25,021) | (33,215) | (43,587)
Prior Service Cost |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | 889 | 941 |
Other comprehensive (loss) income before reclassifications | (1,444) | 86 |
Amounts reclassified from AOCI | (88) | (138) |
Total other comprehensive (loss) income | (1,532) | (52) |
Balance as of end of period | (643) | 889 | 941
Available for Sale Securities |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period | (603) | (21,353) |
Other comprehensive (loss) income before reclassifications | (8,679) | 10,611 |
Amounts reclassified from AOCI | 0 | 10,139 |
Total other comprehensive (loss) income | (8,679) | 20,750 |
Balance as of end of period | $ (9,282) | $ (603) | $ (21,353)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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