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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 6 Months Ended
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Business Acquisition [Line Items]      
Revenues $ 287,003 $ 521,388 $ 514,763
Net income $ 18,255 $ 13,261 $ 25,597
Earnings per share: Basic $ 0.88 $ 0.64 $ 1.24
Earnings per share: Diluted $ 0.84 $ 0.62 $ 1.17