Segment Information (Summary of Segment Perfomance Measures by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 123,765us-gaap_SalesRevenueNet	$ 116,508us-gaap_SalesRevenueNet	$ 254,568us-gaap_SalesRevenueNet	$ 245,769us-gaap_SalesRevenueNet
Gross profit	30,019us-gaap_GrossProfit	26,984us-gaap_GrossProfit	57,670us-gaap_GrossProfit	60,718us-gaap_GrossProfit
Income (loss) before income taxes	10,485	10,730	18,130	28,304
Operating Segments \| Human Health
Segment Reporting Information [Line Items]
Net sales	55,424	39,817	104,503	78,511
Gross profit	16,331	13,027	30,872	24,168
Income (loss) before income taxes	6,972	6,192	12,429	11,727
Operating Segments \| Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	32,579	37,479	70,556	85,903
Gross profit	6,926	7,773	13,076	23,035
Income (loss) before income taxes	2,327	3,526	3,860	14,530
Operating Segments \| Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	35,762	39,212	79,509	81,355
Gross profit	6,762	6,184	13,722	13,515
Income (loss) before income taxes	2,896	2,151	4,820	5,453
Unallocated Corporate
Segment Reporting Information [Line Items]
Net sales
Gross profit
Income (loss) before income taxes	$ (1,710)	$ (1,139)	$ (2,979)	$ (3,406)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

+ Details

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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- Details

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