Annual report pursuant to Section 13 and 15(d)

Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Details)

v3.20.2
Reconciliation of Income Taxes at Federal Statutory Rate to Effective Tax Rate (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]                        
Federal statutory rate                 21.00% 21.00% 25.70%  
State income taxes, net of federal effect                 (0.60%) (4.00%) (0.50%)  
Net effects of foreign tax rate differential and credits                 38.70% 11.30% (12.20%)  
Effective Income Tax Rate Reconciliation, Domestic Manufacturing Deduction                 0.00% 0.00% (1.30%)  
Foreign Branch Currency Losses                 (0.40%) 0.00% (2.10%)  
Effective Income Tax Rate Reconciliation, Compensation Adjustment                 6.60% 4.40% 7.00%  
Impairment and divestiture charges                 3.30% 19.30% 39.10%  
Valuation allowance additions and releases                 (8.10%) 3.90% 20.30%  
Changes in liability for unrecognized tax benefits                 (5.30%) 4.10% (34.10%)  
Effective Income Tax Rate Reconciliation, U.S. Tax Reform, Net Impact                 (32.50%) (31.10%) 2.40%  
Net Benefit Taxable Liquidations of Subsidiaries Percent                 52.60% 0.00% 7.70%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent                 7.40% 16.20% 12.00%  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent                 (9.00%) 1.70% (1.40%)  
Effective Income Tax Rate Reconciliation R&D Credit, audits and adjustments                 (38.90%) 4.80% 15.30%  
Other items                 (5.60%) 5.30% (2.60%)  
Effective income tax rate                 29.20% 56.90% 75.30%  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount                 $ 4,000 $ 3,500 $ 13,300  
Impairment and divestiture (benefit) charges $ 400 $ (1,400) $ (800) $ (1,400) $ 6,200 $ (13,000) $ 6,100 $ 23,500 (3,159) 22,827 2,987 $ 3,000
Impairment, Non-Deductible for Income Tax Purposes                 300 14,000 700  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense                 9,400 1,700 20,400  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction                 12,300 2,900 11,800  
Net Benefit, Taxable Liquidations of Foreign Subsidiaries                 4,100   1,500  
Effective Income Tax Rate Reconciliation, Withholding Tax, Foreign, Amount                 5,400 2,600 1,500  
Effective Income Tax Rate Reconciliation U.S. Tax Reform Net Impact Amount                   (2,600)    
Effective Income Tax Rate Reconciliation R&D Credit, audits and adjustments, amount                 (3,100) 900 $ 2,900  
Non-Cash Impairment charges - foreign earnings                 $ (600) $ 13,800