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Acquisitions - Unaudited Pro Forma Results of Operations (Detail) - BTI Acquisition - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2015
Jan. 31, 2015
Business Acquisition [Line Items]    
Net sales $ 136,573 $ 401,884
Net income $ 8,620 $ 26,064
Net income per share - diluted $ 0.16 $ 0.47