Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 218,223	$ 205,876	$ 418,376	$ 399,288
Depreciation and amortization	6,841	6,631	13,532	13,275
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	20,074	21,211	42,779	40,155
Interest expense	3,015	3,050	5,798	6,168
Depreciation and amortization	6,841	6,631	13,532	13,275
Stock-based compensation			1,129
Acquisition-related cost of goods sold				1,671
Acquisition-related accrued compensation				924
Foreign currency (gains) losses, net	2,617	(323)	(18)	2
Identifiable assets	697,292		697,292		$ 671,679
Animal Health
Segment Reporting Information [Line Items]
Net sales	139,562	132,845	270,751	261,686
Mineral Nutrition
Segment Reporting Information [Line Items]
Net sales	62,319	59,616	117,157	111,689
Performance Products
Segment Reporting Information [Line Items]
Net sales	16,342	13,415	30,468	25,913
Operating Segments
Segment Reporting Information [Line Items]
Net sales	218,223	205,876	418,376	399,288
Depreciation and amortization	6,388	6,108	12,614	12,193
Adjusted EBITDA - Total segments	41,523	40,914	80,518	78,620
Reconciliation of income before income taxes to Adjusted EBITDA
Income before income taxes	20,074	21,211	42,779	40,155
Interest expense	3,015	3,050	5,798	6,168
Depreciation and amortization	6,388	6,108	12,614	12,193
Stock-based compensation	564	0	1,129	0
Acquisition-related cost of goods sold	0	1,422	0	1,671
Acquisition-related accrued compensation	0	487	0	924
Acquisition-related transaction costs	0	0	0	400
Other, net	(1,506)	0	(1,506)	0
Foreign currency (gains) losses, net	2,617	(323)	(18)	2
Adjusted EBITDA - Total segments	41,523	40,914	80,518	78,620
Identifiable assets	582,315		582,315		549,523
Operating Segments | Animal Health
Segment Reporting Information [Line Items]
Net sales	139,562	132,845	270,751	261,686
Depreciation and amortization	5,493	5,265	10,849	10,519
Adjusted EBITDA - Total segments	35,925	35,036	71,641	68,778
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	5,493	5,265	10,849	10,519
Adjusted EBITDA - Total segments	35,925	35,036	71,641	68,778
Identifiable assets	472,534		472,534		455,704
Operating Segments | Mineral Nutrition
Segment Reporting Information [Line Items]
Net sales	62,319	59,616	117,157	111,689
Depreciation and amortization	616	584	1,213	1,169
Adjusted EBITDA - Total segments	4,084	5,614	6,647	9,330
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	616	584	1,213	1,169
Adjusted EBITDA - Total segments	4,084	5,614	6,647	9,330
Identifiable assets	77,351		77,351		69,779
Operating Segments | Performance Products
Segment Reporting Information [Line Items]
Net sales	16,342	13,415	30,468	25,913
Depreciation and amortization	279	259	552	505
Adjusted EBITDA - Total segments	1,514	264	2,230	512
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	279	259	552	505
Adjusted EBITDA - Total segments	1,514	264	2,230	512
Identifiable assets	32,430		32,430		24,040
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	453	523	918	1,082
Reconciliation of income before income taxes to Adjusted EBITDA
Depreciation and amortization	453	523	918	1,082
Corporate costs	9,918	$ 8,436	18,804	$ 16,025
Identifiable assets	$ 114,977		$ 114,977		$ 122,156