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Net Gain on Sale of Property, Plant and Equipment - Additional Information (Detail) - Real Estate Purchase Agreement [Member]
3 Months Ended
May 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]  
Proceeds from sale of facility $ 2,212,000
Gain on sale of facility 1,502,000
sales proceeds held in cash collateral 1,100,000
Loss on disposal of asset $ 222,000