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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense, period of remediation, years | 5 years |  |
Estimated liability costs of remediation | $ 916,000 | $ 916,000 |
Estimated liability, measurement period, years | 15 years |  |
Estimated liability costs of remediation, current | $ 100,000 | 100,000 |
Royalty Expense | 2,795,000 | 2,876,000 | $ 2,659,000
Future minimum royalty payment for period, 2020 | 183,000 |  |
Future minimum royalty payment for period, 2021 | 191,000 |  |
Future minimum royalty payment for period, 2022 | 114,000 |  |
Future minimum royalty payment for period, 2023 | 109,000 |  |
Future minimum royalty payment for period, 2024 | 109,000 |  |
Office and Manufacturing facilities operating lease expense | 871,000 | $ 799,000 | $ 729,000
Future minimum rental payments for 2020 | 1,112,000 |  |
Future minimum rental payments for 2021 | 810,000 |  |
Future minimum rental payments for 2022 | 297,000 |  |
Future minimum rental payments for 2023 | 101,000 |  |
Future minimum rental payments for 2024 | 0 |  |
Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | 38,000 |  |
Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | $ 131,000 |  |

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