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Contingent Liabilities - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended |
|---|---|---|
|
Feb. 28, 2014
|
Feb. 28, 2014
|
|
| Loss Contingencies [Line Items] | ||
| Exposure related to legal matter | $ 2,000,000 | $ 2,000,000 |
| Loss related to litigation settlement | 2,000,000 | |
| Insurance proceeds for replacement value of damaged property and equipment | 2,900,000 | |
| Book value of assets | 145,000 | 145,000 |
| Gain on damaged property and equipment | 2,755,000 | |
| Insurance Claims | $ 417,000 |