Segment Information (Schedule of Segment Perfomance Measures by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Net sales	$ 110,949	$ 121,415	$ 110,707	$ 101,317	$ 121,204	$ 117,881	$ 85,683	[1]	$ 87,660	$ 444,388	$ 412,428	$ 346,631
Gross profit	20,714	22,155	20,644	18,519	19,996	19,432	13,123	[1]	13,287	82,032	65,838	54,155
Income before income taxes										24,740	16,962	10,203
Human Health [Member]
Segment Reporting Information [Line Items]
Net sales										105,249	69,856	47,046
Gross profit										29,932	15,534	7,780
Income before income taxes										11,683	2,898	982
Pharmaceutical Ingredients [Member]
Segment Reporting Information [Line Items]
Net sales										162,998	149,340	136,454
Gross profit										25,472	23,897	22,071
Income before income taxes										8,066	7,294	4,657
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales										176,141	193,232	163,131
Gross profit										26,628	26,407	24,304
Income before income taxes										10,570	10,198	8,229
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Income before income taxes										$ (5,579)	$ (3,428)	$ (3,665)

[1] Includes approximate $2,600 tax charge related to the repatriation of earnings from certain foreign subsidiaries, in connection with the acquisition of Rising and approximately $1,060 of transaction costs related to this acquisition.