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Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Federal statutory rate |  |  |  |  | 21.00% | 25.70% | 35.00%
State income taxes, net of federal effect |  |  |  |  | (4.00%) | (0.50%) | 0.60%
Net effects of foreign tax rate differential and credits |  |  |  |  | 11.30% | (12.20%) | (5.40%)
Domestic Manufacturing Deduction |  |  |  |  | 0.00% | (1.30%) | 0.20%
Foreign Branch Currency Losses |  |  |  |  | 0.00% | (2.10%) | (0.20%)
Compensation Adjustment |  |  |  |  | 4.40% | 7.00% | 0.00%
Impairment and divestiture charges |  |  |  |  | 19.30% | 39.10% | (7.90%)
Valuation allowance additions and releases |  |  |  |  | 3.90% | 20.30% | (12.30%)
Changes in liability for unrecognized tax benefits |  |  |  |  | 4.10% | (34.10%) | (2.60%)
U.S. Tax Reform, Net Impact |  |  |  |  | (31.10%) | 2.40% | 0.00%
Net Benefit, Taxable Liquidations of Foreign Subsidiaries, Percent |  |  |  |  | 0.00% | 7.70% | 15.50%
Foreign Nondeductible Expense |  |  |  |  | 16.20% | 12.00% | (2.10%)
Change in Enacted Tax Rate |  |  |  |  | 1.70% | (1.40%) | (1.50%)
U.S. credits, audits and adjustments |  |  |  |  | 4.80% | 15.30% | 1.00%
Other items |  |  |  |  | 5.30% | (2.60%) | (1.10%)
Effective income tax rate |  |  |  |  | 56.90% | 75.30% | 19.20%
Tax Credit, Foreign, Amount |  |  |  |  | $ 700 | $ 10,200 | $ 4,200
Impairment & divestiture charges | $ 6,200 | $ (13,000) | $ 6,100 | $ 23,500 | 22,827 | 2,987 | 116,979
Non-cash impairment charge - foreign earnings |  |  |  |  | 13,800 |  | 117,000
Impairment, Non-Deductible for Income Tax Purposes |  |  |  |  | 14,000 | 700 | 69,000
Valuation Allowances and Reserves, Additions, Charge to Cost and Expense |  |  |  |  | 1,700 | 20,400 |
Valuation Allowances and Reserves, Deduction |  |  |  |  | 2,900 | 11,800 |
Tax benefit Related to the Tax Cuts and Jobs Act |  |  |  |  | $ 5,800 |  |
Taxable Liquidations of Foreign Subsidiaries |  |  |  |  |  | $ 1,500 | $ 14,900

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