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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018
Allowances for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 176,805 | $ 221,813 | $ 225,726
Additions: Charged to Costs and Expenses | 3,089 | 57,380 | 2,748
Deductions: Write-offs, Net of Recoveries | (14,354) | (102,388) | (6,661)
Balance at End of Year | 165,540 | 176,805 | 221,813
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 246,344 | 230,374 | 289,083
Additions: Charged to Costs and Expenses | 5,206 | 41,260 | 61,854
Deductions: Write-offs, Net of Recoveries | (31,659) | (25,290) | (120,563)
Balance at End of Year | 219,891 | 246,344 | 230,374
Reserve for supplier advance payments |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 110,613 | 130,705 |
Additions: Charged to Costs and Expenses | 0 | 0 | 0
Deductions: Write-offs, Net of Recoveries | 0 | (44,728) | (20,092)
Balance at End of Year | $ 65,885 | $ 110,613 | $ 130,705

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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(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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