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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2023 | May 31, 2023 | May 31, 2022 | May 31, 2021
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Estimated liability costs of remediation | $ 916,000 | $ 916,000 | $ 916,000 |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Liabilities | Liabilities | Liabilities |
Estimated liability, measurement period, years |  | 15 years |  |
Estimated liability costs of remediation, current | $ 100,000 | $ 100,000 |  |
Testing and treatment costs |  | $ 85,000 |  |
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Liabilities, Current | Liabilities, Current |  |
Royalty Expense |  | $ 3,392,000 | $ 1,999,000 | $ 2,129,000
Future minimum royalty payment for period, 2024 | $ 112,000 | 112,000 |  |
Future minimum royalty payment for period, 2025 | 109,000 | 109,000 |  |
Future minimum royalty payment for period, 2026 | 84,000 | 84,000 |  |
Future minimum royalty payment for period, 2027 | 84,000 | 84,000 |  |
Future minimum royalty payment for period, 2028 | 67,000 | 67,000 |  |
Estimated liability costs of remediation, non current | $ 816,000 | $ 816,000 |  |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |  |
Accrual reversed | $ 600,000 |  |  |
Environmental loss contingencies, charges to expense for potential fines or penalties |  | $ 600,000 |  |
Debt issuance costs incurred | $ 6,683,000 | 6,683,000 |  |
Minimum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Environmental remediation expense |  | $ 63,000 |  |
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Operating Expenses |  |
Maximum |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |
Environmental remediation expense |  | $ 131,000 |  |
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Operating Expenses |  |

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