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Income Taxes (Details) - USD ($) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Aug. 31, 2020 | Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Federal income tax computed at statutory rate | $ 68,200,000 | $ 89,200,000 | $ 109,400,000 |
State income tax, net of federal income tax benefit | 9,700,000 | 12,200,000 | 11,500,000 |
Foreign permanent differences and rate differential | 2,400,000 | 2,100,000 | (2,000,000.0) |
Research and development tax credits | (7,100,000) | (18,100,000) | (3,300,000) |
Unrecognized tax benefits | 1,800,000 | 12,200,000 | 400,000 |
Other, net | 1,400,000 | (900,000) | (5,100,000) |
Total provision for income taxes | 76,400,000 | 94,500,000 | 76,300,000 |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount | 0 | (2,200,000) | (34,600,000) |
Deferred income tax liabilities: |  |  |  |
Depreciation | (23,300,000) | (22,000,000.0) |  | $ (22,000,000.0)
Goodwill and intangibles | (153,100,000) | (149,600,000) |  | (149,600,000)
Operating lease right of use asset | (15,600,000) |  |  |
Other liabilities | (5,300,000) | (2,800,000) |  | (2,800,000)
Total deferred income tax liabilities | (197,300,000) | (174,400,000) |  | (174,400,000)
Deferred income tax assets: |  |  |  |
Self-insurance | 2,100,000 | 2,600,000 |  | 2,600,000
Pension | 22,200,000 | 22,700,000 |  | 22,700,000
Deferred compensation | 22,200,000 | 20,500,000 |  | 20,500,000
Net operating losses | 5,600,000 | 6,200,000 |  | 6,200,000
Other accruals not yet deductible | 32,000,000.0 | 26,900,000 |  | 26,900,000
Operating lease liabilities | 18,200,000 |  |  |
Other assets | 9,300,000 | 9,700,000 |  | 9,700,000
Total deferred income tax assets | 111,600,000 | 88,600,000 |  | 88,600,000
Valuation allowance | (6,500,000) | (4,600,000) |  | (4,600,000)
Net deferred income tax liabilities | (92,200,000) | (90,400,000) |  | (90,400,000)
Undistributed earnings and original investments in foreign subsidiaries | 144,900,000 | 144,900,000 |  | 144,900,000
Deferred income tax liability for certain foreign withholding taxes and U.S. state taxes | 2,900,000 |  |  |
Tax benefit related to the enactment of the TCJA |  |  |  | 36,800,000
Tax benefit to decrease deferred income taxes to the revised statutory rate |  |  |  | 32,500,000
Current estimated benefit for transition tax |  |  |  | 4,300,000
State tax credit carryforwards | 1,600,000 |  |  |
Unrecognized tax benefits | 17,200,000 | 16,600,000 | $ 4,400,000 | 16,600,000
Unrecognized tax benefits that if recognized would affect annual effective tax rate | 16,700,000 | 15,900,000 |  | 15,900,000
Total accrued interest | 1,700,000 | $ 1,000,000.0 |  | $ 1,000,000.0
Accruals related to income tax penalties | 0 |  |  |
Internal Revenue Service (IRS) |  |  |  |
Deferred income tax assets: |  |  |  |
Operating loss carryforwards | 32,000,000.0 |  |  |
State and Local Jurisdiction |  |  |  |
Deferred income tax assets: |  |  |  |
Operating loss carryforwards | 21,200,000 |  |  |
Foreign Tax Authority |  |  |  |
Deferred income tax assets: |  |  |  |
Operating loss carryforwards | $ 2,900,000 |  |  |

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