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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Nov. 30, 2018 | May 31, 2018
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 |
Minimum |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Environmental remediation expense | 38,000 |
Maximum |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Environmental remediation expense | $ 74,000 |

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