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Description of Business and Summary of Significant Accounting Policies (Summary of Changes in AOCI) (Details 4) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance |  | $ (39,877) |  |
Other comprehensive income (loss) before reclassifications |  | 67,871 |  |
Amounts reclassified from AOCI |  | 26,626 |  |
Other comprehensive income (loss) |  | 94,497 | $ 10,977 | $ (137,816)
Ending balance |  | 54,620 | (39,877) |
Foreign currency translation adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [1] | 16,338 |  |
Other comprehensive income (loss) before reclassifications | [1] | 35,297 |  |
Amounts reclassified from AOCI | [1] | 5,947 |  |
Other comprehensive income (loss) | [1] | 41,244 |  |
Ending balance | [1] | 57,582 | 16,338 |
Derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [2] | 7,784 |  |
Other comprehensive income (loss) before reclassifications | [2] | 13,434 |  |
Amounts reclassified from AOCI | [2] | 8,749 |  |
Other comprehensive income (loss) | [2] | 22,183 |  |
Ending balance | [2] | 29,967 | 7,784 |
Actuarial loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [3] | (43,587) |  |
Other comprehensive income (loss) before reclassifications | [3] | 8,443 |  |
Amounts reclassified from AOCI | [3] | 1,929 |  |
Other comprehensive income (loss) | [3] | 10,372 |  |
Ending balance | [3] | (33,215) | (43,587) |
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [3] | 941 |  |
Other comprehensive income (loss) before reclassifications | [3] | 86 |  |
Amounts reclassified from AOCI | [3] | (138) |  |
Other comprehensive income (loss) | [3] | (52) |  |
Ending balance | [3] | 889 | 941 |
Available for sale securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning balance | [4] | (21,353) |  |
Other comprehensive income (loss) before reclassifications | [4] | 10,611 |  |
Amounts reclassified from AOCI | [4] | 10,139 |  |
Other comprehensive income (loss) | [4] | 20,750 |  |
Ending balance | [4] | $ (603) | $ (21,353) |
[1] | (1) There is no tax benefit (expense) related to the foreign currency translation adjustment components of AOCI, including reclassification adjustments, for the fiscal years ended August 31, 2017 and 2016 .
[2] | (2) The portions of AOCI reclassified into earnings during the fiscal years ended August 31, 2017 and 2016 for derivative instruments were primarily classified as a component of cost of revenue. The portion that is expected to be reclassifie d into earnings during the next 12 months will primarily be classified as a component of cost of revenue. The annual tax benefit (expense) for unrealized gains on derivative instruments, including reclassification adjustments, is $ (1.9) million and $ (4.0) million for the fiscal years ended August 31, 2017 and 2016 , respectively. The accumulated tax benefit (expense) for unrealized gains on derivative instruments, including reclassification adjustments, is $ 13.4 million and $ 15.3 million for the fiscal years ended August 31, 2017 and 2016 , respectively.
[3] | (3) The portions of AOCI reclassified into earnings during the fiscal years ended August 31, 2017 and 2016 for actuarial gain and prior servic e cost are included in the computation of net periodic benefit pension cost. Refer to Note 10 – “Postretirement and Other Employee Benefits” for additional information . The tax benefit (expense) for actuarial gain, including reclassification adjustments, i s $(1.0) million and $0.6 million, and for prior service cost, including reclassification adjustments, is $(0.3) million and $(0.3) million for the fiscal years ended August 31, 2017 and 2016 .
[4] | (4) The portion of AOCI reclassified into e arnings during the fiscal year ended August 31, 2017 for available for sale securities was due to an other than temporary impairment on securities and was classified as a component of other expense. There is no tax benefit (expense) related to the available for sale securities components of AOCI, including reclassification adjustments, for the fiscal years ended August 31, 2017 and 2016 .

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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