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Schedule of Valuation and Qualifying Accounts (Details 3) - Valuation allowance for deferred taxes - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Balance at beginning of period |  | $ 344,828 | $ 304,820 | $ 261,285
Additions charged to costs and expenses | [1] | 65,300 | 23,891 | 79,933
Additions (reductions) charged to other accounts | [2] | (97,203) | 28,238 | (29,069)
Reductions charged to costs and expenses | [3] | (27,366) | (12,121) | (7,329)
Balance at end of period |  | $ 285,559 | $ 344,828 | $ 304,820
[1] | (1) During the fiscal years ended August 31, 2017 , 2016 and 2015 , the additions charged to costs and expenses primarily relate to the increase of deferred tax assets for sites with existing valuation allowances.
[2] | During the fiscal year ended August 31, 2017 , the reductions charged to other accounts primarily relate to the decrease of net operating loss carry forwards due to non-U.S. unrecognized tax benefits and a non-U.S. tax audit. During the fiscal year ended August 31, 2016 , the additions charged to other accounts primarily related to the recognition of excess tax benefits due to the early adoption of the new accounting guidance for share-based payment transactions .
[3] | (3) During the fiscal year ended August 31, 2017 , the reductions charged to costs and expenses primarily relate to the release of certain non-U.S. valuation allowances .

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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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