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Pension Plan - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2019 | Feb. 28, 2019 | Feb. 29, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees covered under noncontributory Pension Plan | 16.00% |  |
Compensation period preceding retirement and termination | 5 years |  |
Period used for calculating Pension Plan liability | 25 years |  |
Company contributions |  | $ 3,000,000 |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions | $ 1,300,000 |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions | $ 1,500,000 |  |
Scenario Forecast [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum required contribution to the plan |  |  | $ 0

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