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Restructuring and Other Expense (Income), Net - Schedule of Progression of Liabilities Associated with Restructuring Activities, Combined with Reconciliation to Restructuring and Other Expense (Income), Net (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     $ 776  
Expense (income)     (26)  
Payments     (652)  
Adjustments     (8)  
Ending Balance $ 90   90  
Net loss on sale of assets     431  
Restructuring and other expense (income), net (50) $ 402 405 $ (534)
Early Retirement And Severance        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     774  
Expense (income)     0  
Payments     (596)  
Adjustments     (89)  
Ending Balance 89   89  
Facility Exit And Other Costs        
Restructuring Cost and Reserve [Line Items]        
Beginning Balance     2  
Expense (income)     (26)  
Payments     (56)  
Adjustments     81  
Ending Balance $ 1   $ 1