Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 191,598	$ 191,773	$ 379,585	$ 378,893
Depreciation and amortization	6,444	5,393	12,762	10,822
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	19,304	16,097	36,876	39,589
Interest expense, net	3,872	3,967	7,779	7,786
Depreciation and amortization	6,444	5,393	12,762	10,822
Acquisition-related accrued compensation			840	840
Pension settlement cost	1,702		1,702
Foreign currency (gains) losses, net	(548)	2,557	(214)	(2,896)
Identifiable assets	592,285		592,285		$ 607,835
Operating Segments
Segment Reporting Information [Line Items]
Net sales	191,598	191,773	379,585	378,893
Depreciation and amortization	5,788	4,635	11,446	9,313
Adjusted EBITDA - Total segments	39,610	36,532	76,959	71,254
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	19,304	16,097	36,876	39,589
Interest expense, net	3,872	3,967	7,779	7,786
Depreciation and amortization	5,788	4,635	11,446	9,313
Acquisition-related accrued compensation	420	420	840	840
Acquisition-related transaction costs	1,274		1,274
Adjusted EBITDA - Total segments	39,610	36,532	76,959	71,254
Pension settlement cost	1,702		1,702
Foreign currency (gains) losses, net	(548)	2,557	(214)	(2,896)
Identifiable assets	514,035		514,035		524,247
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Net sales	123,673	121,504	248,174	241,638
Depreciation and amortization	5,011	3,829	9,909	7,705
Adjusted EBITDA - Total segments	34,609	32,351	67,228	63,827
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	5,011	3,829	9,909	7,705
Adjusted EBITDA - Total segments	34,609	32,351	67,228	63,827
Identifiable assets	436,174		436,174		444,751
Operating Segments | Mineral Nutrition
Segment Reporting Information [Line Items]
Net sales	56,699	58,853	108,291	113,322
Depreciation and amortization	542	612	1,084	1,220
Adjusted EBITDA - Total segments	4,741	4,189	8,729	7,349
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	542	612	1,084	1,220
Adjusted EBITDA - Total segments	4,741	4,189	8,729	7,349
Identifiable assets	56,615		56,615		57,939
Operating Segments | Performance Products
Segment Reporting Information [Line Items]
Net sales	11,226	11,416	23,120	23,933
Depreciation and amortization	235	194	453	388
Adjusted EBITDA - Total segments	260	(8)	1,002	78
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	235	194	453	388
Adjusted EBITDA - Total segments	260	(8)	1,002	78
Identifiable assets	21,246		21,246		21,557
Operating Segments | MFAs and other | Animal Health
Segment Reporting Information [Line Items]
Net sales	77,475	85,569	160,894	171,090
Operating Segments | Nutritional specialties | Animal Health
Segment Reporting Information [Line Items]
Net sales	29,247	24,222	55,551	46,592
Operating Segments | Vaccines | Animal Health
Segment Reporting Information [Line Items]
Net sales	16,951	11,713	31,729	23,956
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	656	758	1,316	1,509
Adjusted EBITDA - Total segments	8,416	8,098	15,940	15,113
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	656	758	1,316	1,509
Adjusted EBITDA - Total segments	8,416	$ 8,098	15,940	$ 15,113
Identifiable assets	$ 78,250		$ 78,250		$ 83,588