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Acquisitions - Summary of Unaudited Pro Forma Consolidated Results of Operations (Detail) - Qualspec Group [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Business Acquisition [Line Items]    
Revenues $ 238,408 $ 227,760
Net income $ 1,679 $ 7,342
Earnings per share: Basic $ 0.08 $ 0.36
Earnings per share: Diluted $ 0.08 $ 0.35