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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 |  |

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