Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 171,229	$ 125,552	$ 356,484	$ 253,570
Gross profit	33,970	30,805	73,953	61,644
Income (loss) before income taxes	(499)	(934)	1,639	5,846
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	103,466	53,981	209,481	101,870
Gross profit	22,898	16,919	47,545	31,124
Income (loss) before income taxes	2,288	4,933	7,314	8,905
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	33,629	36,816	70,205	77,432
Gross profit	4,381	5,658	10,221	12,612
Income (loss) before income taxes	577	1,196	2,808	4,263
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	34,134	34,755	76,798	74,268
Gross profit	6,691	8,228	16,187	17,908
Income (loss) before income taxes	2,477	3,733	7,422	8,565
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Gross profit	0	0	0	0
Income (loss) before income taxes	$ (5,841)	$ (10,796)	$ (15,905)	$ (15,887)