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Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]        
Net sales $ 157,926 $ 145,796 $ 423,100 $ 400,364
Gross profit 38,289 36,598 108,738 94,268
Income (loss) before income taxes 15,544 13,626 43,620 31,756
Operating Segments | Human Health        
Segment Reporting Information [Line Items]        
Net sales 58,780 56,305 175,306 160,808
Gross profit 19,125 19,957 61,172 50,829
Income (loss) before income taxes 8,630 8,667 29,927 21,096
Operating Segments | Pharmaceutical Ingredients        
Segment Reporting Information [Line Items]        
Net sales 45,841 40,548 118,496 111,104
Gross profit 8,648 6,674 20,870 19,750
Income (loss) before income taxes 4,608 1,533 8,389 5,393
Operating Segments | Performance Chemicals        
Segment Reporting Information [Line Items]        
Net sales 53,305 48,943 129,298 128,452
Gross profit 10,516 9,967 26,696 23,689
Income (loss) before income taxes $ 6,972 $ 5,105 $ 13,776 $ 9,925
Unallocated Corporate        
Segment Reporting Information [Line Items]        
Net sales
Gross profit
Income (loss) before income taxes $ (4,666) $ (1,679) $ (8,472) $ (4,658)