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Pension Plan - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
May 31, 2019
Feb. 28, 2019
Feb. 29, 2020
Defined Benefit Plan Disclosure [Line Items]      
Employees covered under noncontributory Pension Plan 17.00%    
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 $ 1,000,000    
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