Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 145,796	$ 124,830	$ 400,364	$ 370,599
Gross profit	36,598	24,963	94,268	85,681
Income (loss) before income taxes	13,626	7,904	31,756	36,208
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	56,305	33,946	160,808	112,457
Gross profit	19,957	10,076	50,829	34,244
Income (loss) before income taxes	8,667	3,234	21,096	14,961
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	40,548	47,843	111,104	133,746
Gross profit	6,674	7,408	19,750	30,443
Income (loss) before income taxes	1,533	2,798	5,393	17,328
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	48,943	43,041	128,452	124,396
Gross profit	9,967	7,479	23,689	20,994
Income (loss) before income taxes	5,105	3,555	9,925	9,008
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
Income (loss) before income taxes	$ (1,679)	$ (1,683)	$ (4,658)	$ (5,089)