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Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Allowance for uncollectible accounts receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 14,134 | $ 11,094 | $ 11,663
Additions and Adjustments Charged to Costs and Expenses | 12,545 | 6,255 | 292
Additions/ (Reductions) Charged to Other Accounts | 0 | 0 | 0
Write-offs/Reductions Charged to Costs and Expenses | (11,498) | (3,215) | (861)
Balance at End of Period | 15,181 | 14,134 | 11,094
Reserve for excess and obsolete inventory |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 46,013 | 32,221 | 43,477
Additions and Adjustments Charged to Costs and Expenses | 35,538 | 46,030 | 12,145
Additions/ (Reductions) Charged to Other Accounts | 0 | 0 | 0
Write-offs/Reductions Charged to Costs and Expenses | (20,611) | (32,238) | (23,401)
Balance at End of Period | 60,940 | 46,013 | 32,221
Valuation allowance for deferred taxes |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 285,559 | 344,828 | 304,820
Additions and Adjustments Charged to Costs and Expenses | 18,418 | 65,300 | 23,891
Additions/ (Reductions) Charged to Other Accounts | (886) | (97,203) | 28,238
Write-offs/Reductions Charged to Costs and Expenses | (79,604) | (27,366) | (12,121)
Balance at End of Period | $ 223,487 | $ 285,559 | $ 344,828

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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