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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
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 | 2,278,000 | 1,837,000 | 1,371,000
Guaranteed minimum royalty payment for period, 2015 | 658,000 |  |
Guaranteed minimum royalty payment for period, 2016 | 700,000 |  |
Guaranteed minimum royalty payment for period, 2017 | 669,000 |  |
Guaranteed minimum royalty payment for period, 2018 | 769,000 |  |
Office and Manufacturing facilities operating lease expense | 856,000 | 657,000 | 495,000
Future minimum rental payments for 2015 | 470,000 |  |
Future minimum rental payments for 2016 | 324,000 |  |
Future minimum rental payments for 2017 | 130,000 |  |
Future minimum rental payments for 2018 | 74,000 |  |
Future minimum rental payments for 2019 and later | 96,000 |  |
Minimum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | 47,000 |  |
Maximum |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Environmental remediation expense | $ 79,000 |  |

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