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Employee Pension Plans - Reconciliation of Changes in Projected Benefit Obligation and Fair Value of Plan Assets and Funded Status of Defined-benefit Plans (Detail) - USD ($)
$ in Thousands
12 Months Ended 17 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
May 31, 2022
Change in benefit obligation        
Interest cost $ 2,621 $ 1,205 $ 1,352  
Change in plan assets        
Return on plan assets 4,473 4,289 1,928  
Pension Benefit        
Change in benefit obligation        
Benefit obligation, beginning of year 41,195 46,167    
Interest cost 2,621 1,205    
Actuarial gain (24,755) (4,814)    
Benefits paid   (1,345)   $ (4,511)
Settlements   (18)   (2,929)
Benefit obligations acquired       101,946
Benefits obligation, end of year 113,567 41,195 46,167 113,567
Change in plan assets        
Fair value, beginning of year 33,136 28,510    
Return on plan assets 11,379 (4,289)    
Company contributions 2,308 1,700    
Benefits paid (4,511) (1,345)    
Settlements (2,929) (18)    
Plan assets acquired 66,768      
Fair value, end of year 83,393 33,136 $ 28,510 83,393
Funded status (30,174) (8,059)   (30,174)
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets 6,736 17,541   6,736
Amounts recognized in accumulated other comprehensive loss consist of:        
Net loss (income) 6,736 17,541   6,736
Total 6,736 17,541   6,736
Other Benefits        
Change in benefit obligation        
Service cost 15      
Interest cost 70      
Actuarial gain (873)      
Benefits paid (125)      
Participant contributions 8      
Benefit obligations acquired 4,982      
Benefits obligation, end of year 4,077     4,077
Change in plan assets        
Company contributions 117      
Benefits paid (125)      
Participant contributions 8      
Funded status (4,077)     (4,077)
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets (873)     (873)
Amounts recognized in accumulated other comprehensive loss consist of:        
Net loss (income) (873)     (873)
Total (873)     (873)
Other Liabilities | Pension Benefit        
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets (30,174) (8,059)   (30,174)
Amounts recognized in accumulated other comprehensive loss consist of:        
Total (30,174) (8,059)   (30,174)
Other Liabilities | Other Benefits        
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets (4,077)     (4,077)
Amounts recognized in accumulated other comprehensive loss consist of:        
Total (4,077)     (4,077)
Accumulated Other Comprehensive Loss | Pension Benefit        
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets 6,736 17,541   6,736
Amounts recognized in accumulated other comprehensive loss consist of:        
Total 6,736 $ 17,541   6,736
Accumulated Other Comprehensive Loss | Other Benefits        
Amounts recognized in the consolidated balance sheets consist of:        
Amounts recognized in the consolidated balance sheets (873)     (873)
Amounts recognized in accumulated other comprehensive loss consist of:        
Total $ (873)     $ (873)