Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 190,128	$ 157,926	$ 443,698	$ 423,100
Gross profit	42,319	38,289	103,963	108,738
Income (loss) before income taxes	8,512	15,544	14,358	43,620
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	99,816	58,780	201,686	175,306
Gross profit	25,300	19,125	56,424	61,172
Income (loss) before income taxes	5,007	8,630	13,912	29,927
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	43,821	45,841	121,253	118,496
Gross profit	7,255	8,648	19,867	20,870
Income (loss) before income taxes	3,036	4,608	7,299	8,389
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	46,491	53,305	120,759	129,298
Gross profit	9,764	10,516	27,672	26,696
Income (loss) before income taxes	5,034	6,972	13,599	13,776
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
Income (loss) before income taxes	$ (4,565)	$ (4,666)	$ (20,452)	$ (8,472)