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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Aug. 31, 2019 | Aug. 31, 2018 | Aug. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Federal income tax computed at statutory rate | $ 89,200,000 | $ 109,400,000 | $ 172,400,000
State income tax, net of federal income tax benefit | 12,200,000 | 11,500,000 | 12,200,000
Foreign permanent differences and rate differential | 2,100,000 | (2,000,000.0) | (1,600,000)
Discrete income tax benefits of the TCJA | (2,200,000) | (34,600,000) | 0
Research and development tax credits | (18,100,000) | (3,300,000) | (3,000,000.0)
Unrecognized tax benefits | 12,200,000 | 400,000 | 800,000
Other, net | (900,000) | (5,100,000) | (9,900,000)
Total provision for income taxes | 94,500,000 | 76,300,000 | 170,900,000
Deferred income tax liabilities: |  |  |
Depreciation | (22,000,000.0) | (15,000,000.0) |
Goodwill and intangibles | (149,600,000) | (151,200,000) |
Other liabilities | (2,800,000) | (2,300,000) |
Total deferred income tax liabilities | (174,400,000) | (168,500,000) |
Deferred income tax assets: |  |  |
Self-insurance | 2,600,000 | 2,600,000 |
Pension | 22,700,000 | 18,100,000 |
Deferred compensation | 20,500,000 | 23,700,000 |
Net operating losses | 6,200,000 | 6,200,000 |
Other accruals not yet deductible | 26,900,000 | 24,900,000 |
Other assets | 9,700,000 | 7,000,000.0 |
Total deferred income tax assets | 88,600,000 | 82,500,000 |
Valuation allowance | (4,600,000) | (3,600,000) |
Net deferred income tax liabilities | (90,400,000) | (89,600,000) |
Discrete tax benefit | 36,800,000 |  |
Provisional benefit to decrease Company's deferred income taxes to a revised statutory federal rate | 32,500,000 |  |
Current estimated benefit for transition tax on unremitted foreign earnings | 4,300,000 |  |
Undistributed earnings and original investments in foreign subsidiaries | 107,700,000 |  |
Deferred income tax liability for certain foreign withholding taxes and U.S. state taxes | 600,000 |  |
State tax credit carryforwards | 2,200,000 |  |
Unrecognized tax benefits | 16,600,000 | 4,400,000 | $ 6,000,000.0
Unrecognized tax benefits that if recognized would affect annual effective tax rate | 15,900,000 | 3,800,000 |
Total accrued interest | 1,000,000.0 | $ 500,000 |
Accruals related to income tax penalties | 0 |  |
Internal Revenue Service (IRS) |  |  |
Deferred income tax assets: |  |  |
Operating loss carryforwards | 32,900,000 |  |
State and Local Jurisdiction |  |  |
Deferred income tax assets: |  |  |
Operating loss carryforwards | 20,300,000 |  |
Foreign Tax Authority |  |  |
Deferred income tax assets: |  |  |
Operating loss carryforwards | $ 1,800,000 |  |

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