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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
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 costs of remediation, current | $ 50,000 | 50,000 |
Estimated liability, measurement period, years | 15 years |  |
Royalty Expense | $ 2,189,000 | 2,278,000 | $ 1,837,000
Future minimum royalty payment for period, 2016 | 643,000 |  |
Future minimum royalty payment for period, 2017 | 634,000 |  |
Future minimum royalty payment for period, 2018 | 659,000 |  |
Future minimum royalty payment for period, 2019 | 659,000 |  |
Office and Manufacturing facilities operating lease expense | 736,000 | $ 856,000 | $ 657,000
Future minimum rental payments for 2016 | 424,000 |  |
Future minimum rental payments for 2017 | 161,000 |  |
Future minimum rental payments for 2018 | 161,000 |  |
Future minimum rental payments for 2019 | 85,200 |  |
Future minimum rental payments for 2020 and later | 62,400 |  |
Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | 47,000 |  |
Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | $ 56,000 |  |

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