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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 13, 2021
May 31, 2022
May 31, 2021
May 31, 2020
Commitments and Contingencies Disclosure [Line Items]        
Environmental remediation expense   $ 305,000    
Estimated liability costs of remediation   $ 916,000 $ 916,000  
Estimated liability, measurement period, years   15 years    
Estimated liability costs of remediation, current   $ 100,000    
Royalty Expense   1,999,000 $ 2,129,000 $ 2,524,000
Future minimum royalty payment for period, 2022   100,000    
Future minimum royalty payment for period, 2023   100,000    
Future minimum royalty payment for period, 2024   100,000    
Future minimum royalty payment for period, 2025   75,000    
Future minimum royalty payment for period, 2026   75,000    
Estimated liability costs of remediation, non current   816,000    
Environmental loss contingencies, charges to expense for potential fines or penalties   600,000    
Debt instrument, face amount $ 650,000      
Debt issuance costs incurred $ 9,800      
Debt instrument, term 5 years      
Inventories [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Unconditional Purchase Obligation   85,800,000    
Inventories [Member] | Next 12 months [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Unconditional Purchase Obligation   83,100,000    
Capital Equipment Purchases [Member] | 1-3 years [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Unconditional Purchase Obligation   2,700,000    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Debt Instrument Description Of Variable Rate Basis Secured Overnight Financing Rate (SOFR) plus 225 basis points      
Minimum        
Commitments and Contingencies Disclosure [Line Items]        
Environmental remediation expense   63,000    
Maximum        
Commitments and Contingencies Disclosure [Line Items]        
Environmental remediation expense   $ 131,000