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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
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9 Months Ended | 12 Months Ended |
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Feb. 28, 2014
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May 31, 2013
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| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Impact to fair value of derivative assets and liabilities as a result of recognition on a net basis | $ 230,000 | $ 740,000 |
| Losses in accumulated other comprehensive income expected to be reclassified into net earnings | (2,077,000) | |
| Losses in accumulated other comprehensive income expected to be reclassified into net earnings, tax | $ 1,121,000 |