Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 189,861		$ 183,461	$ 569,446	$ 562,354
Depreciation and amortization	6,842		5,856	19,604	16,678
Adjusted EBITDA - Total segments	36,595		36,653	113,554	107,907
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	26,448		19,149	63,324	58,738
Interest expense, net	3,929		4,265	11,708	12,051
Depreciation and amortization	6,842		5,856	19,604	16,678
Acquisition-related accrued compensation	420		420	1,260	1,260
Pension settlement cost		$ 1,702		1,702
Foreign currency (gains) losses, net	(403)		(2,243)	(617)	(5,139)
Adjusted EBITDA - Total segments	36,595		36,653	113,554	107,907
Identifiable assets	602,278			602,278		$ 607,835
Operating Segments
Segment Reporting Information [Line Items]
Net sales	189,861		183,461	569,446	562,354
Depreciation and amortization	6,177		5,098	17,623	14,411
Adjusted EBITDA - Total segments	36,595		36,653	113,554	107,907
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	26,448		19,149	63,324	58,738
Interest expense, net	3,929		4,265	11,708	12,051
Depreciation and amortization	6,177		5,098	17,623	14,411
Acquisition-related cost of goods sold			1,601		1,601
Acquisition-related accrued compensation	420		420	1,260	1,260
Acquisition-related transaction costs			618	1,274	618
Pension settlement cost				1,702
Gain on insurance settlement	(7,500)			(7,500)
Foreign currency (gains) losses, net	(403)		(2,243)	(617)	(5,139)
Adjusted EBITDA - Total segments	36,595		36,653	113,554	107,907
Identifiable assets	514,061			514,061		524,247
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Net sales	120,976		118,328	369,150	359,966
Depreciation and amortization	5,311		4,246	15,220	11,951
Adjusted EBITDA - Total segments	31,806		32,151	99,034	95,978
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	5,311		4,246	15,220	11,951
Adjusted EBITDA - Total segments	31,806		32,151	99,034	95,978
Identifiable assets	435,881			435,881		444,751
Operating Segments | Mineral Nutrition
Segment Reporting Information [Line Items]
Net sales	57,169		53,029	165,460	166,351
Depreciation and amortization	611		656	1,695	1,876
Adjusted EBITDA - Total segments	4,343		4,012	13,072	11,361
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	611		656	1,695	1,876
Adjusted EBITDA - Total segments	4,343		4,012	13,072	11,361
Identifiable assets	57,112			57,112		57,939
Operating Segments | Performance Products
Segment Reporting Information [Line Items]
Net sales	11,716		12,104	34,836	36,037
Depreciation and amortization	255		196	708	584
Adjusted EBITDA - Total segments	446		490	1,448	568
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	255		196	708	584
Adjusted EBITDA - Total segments	446		490	1,448	568
Identifiable assets	21,068			21,068		21,557
Operating Segments | MFAs and other | Animal Health
Segment Reporting Information [Line Items]
Net sales	76,354		82,445	237,248	253,535
Operating Segments | Nutritional specialties | Animal Health
Segment Reporting Information [Line Items]
Net sales	27,613		22,792	83,164	69,384
Operating Segments | Vaccines | Animal Health
Segment Reporting Information [Line Items]
Net sales	17,009		13,091	48,738	37,047
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	665		758	1,981	2,267
Adjusted EBITDA - Total segments	6,859		6,987	22,799	22,100
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	665		758	1,981	2,267
Adjusted EBITDA - Total segments	6,859		$ 6,987	22,799	$ 22,100
Identifiable assets	$ 88,217			$ 88,217		$ 83,588