Segment Information (Schedule of Segment Perfomance Measures by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 124,830	$ 150,871	$ 370,599	$ 376,575
Gross profit	24,963	31,527	85,681	73,740
Income (loss) before income taxes	7,904	11,587	36,208	26,307
Operating Segments [Member] | Human Health [Member]
Segment Reporting Information [Line Items]
Net sales	33,946	36,299	112,457	92,559
Gross profit	10,076	11,052	34,244	28,062
Income (loss) before income taxes	3,234	5,389	14,961	12,760
Operating Segments [Member] | Pharmaceutical Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales	47,843	61,776	133,746	142,169
Gross profit	7,408	13,382	30,443	25,429
Income (loss) before income taxes	2,798	8,794	17,328	12,432
Operating Segments [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales	43,041	52,796	124,396	141,847
Gross profit	7,479	7,093	20,994	20,249
Income (loss) before income taxes	3,555	3,010	9,008	8,391
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (1,683)	$ (5,606)	$ (5,089)	$ (7,276)