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Pension Plan - Additional Information (Detail) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2022 | Aug. 31, 2021 | Feb. 28, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees covered under noncontributory Pension Plan |  | 12.00% |
Compensation period preceding retirement and termination |  | 5 years |
Period used for calculating Pension Plan liability |  | 25 years |
Unfunded pension liability |  | $ 6,299,000 | $ 6,299,000
Pension settlement charge |  | 2,300,000 |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions |  | 1,500,000 |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions |  | $ 3,000,000.0 |
Scenario Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum required contribution to the plan | $ 0 |  |

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