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Schedule of Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Reversal of valuation allowance | $ 17,500 |  |
U.S. |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Reversal of valuation allowance | 17,500 |  |
Allowance for uncollectible accounts receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 15,181 | $ 14,134 | $ 11,094
Additions and Adjustments Charged to Costs and Expenses | 15,867 | 12,545 | 6,255
Additions/ (Reductions) Charged to Other Accounts | 0 | 0 | 0
Write-offs/Reductions Charged to Costs and Expenses | (13,827) | (11,498) | (3,215)
Balance at End of Period | 17,221 | 15,181 | 14,134
Reserve for excess and obsolete inventory |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 60,940 | 46,013 | 32,221
Additions and Adjustments Charged to Costs and Expenses | 34,091 | 35,538 | 46,030
Additions/ (Reductions) Charged to Other Accounts | 0 | 0 | 0
Write-offs/Reductions Charged to Costs and Expenses | (25,478) | (20,611) | (32,238)
Balance at End of Period | 69,553 | 60,940 | 46,013
Valuation allowance for deferred taxes |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 223,487 | 285,559 | 344,828
Additions and Adjustments Charged to Costs and Expenses | 22,750 | 18,418 | 65,300
Additions/ (Reductions) Charged to Other Accounts | 58,117 | (886) | (97,203)
Write-offs/Reductions Charged to Costs and Expenses | (16,750) | (79,604) | (27,366)
Balance at End of Period | $ 287,604 | $ 223,487 | $ 285,559

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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