Segment Information (Summary of Segment Performance Measures by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 163,649	$ 171,229	$ 328,054	$ 356,484
Gross profit	24,046	33,970	49,526	73,953
(Loss) income before income taxes	(21,810)	(499)	(40,905)	1,639
Human Health
Segment Reporting Information [Line Items]
Net sales	84,981	103,466	165,827	209,481
Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	42,042	33,629	80,890	70,205
Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	36,626	34,134	81,337	76,798
Operating Segments | Human Health
Segment Reporting Information [Line Items]
Net sales	84,981	103,466	165,827	209,481
Gross profit	10,822	22,898	19,298	47,545
(Loss) income before income taxes	(10,596)	2,288	(23,643)	7,314
Operating Segments | Pharmaceutical Ingredients
Segment Reporting Information [Line Items]
Net sales	42,042	33,629	80,890	70,205
Gross profit	6,353	4,381	13,247	10,221
(Loss) income before income taxes	2,321	577	5,719	2,808
Operating Segments | Performance Chemicals
Segment Reporting Information [Line Items]
Net sales	36,626	34,134	81,337	76,798
Gross profit	6,871	6,691	16,981	16,187
(Loss) income before income taxes	3,245	2,477	9,173	7,422
Unallocated Corporate
Segment Reporting Information [Line Items]
(Loss) income before income taxes	$ (16,780)	$ (5,841)	$ (32,154)	$ (15,905)