Revenue Recognition (Summary of revenues disaggregated by business segment and product lines) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 163,649	$ 171,229	$ 328,054	$ 356,484
Finished dosage from generic drugs
Disaggregation of Revenue [Line Items]
Revenues	73,663	90,761	142,876	186,322
Nutraceutical products
Disaggregation of Revenue [Line Items]
Revenues	11,318	12,705	22,951	23,159
Pharmaceutical intermediates
Disaggregation of Revenue [Line Items]
Revenues	12,532	9,839	22,754	19,975
Active pharmaceutical ingredients (APIs)
Disaggregation of Revenue [Line Items]
Revenues	29,510	23,790	58,136	50,230
Specialty chemicals
Disaggregation of Revenue [Line Items]
Revenues	31,582	30,533	67,803	64,553
Agricultural protection products
Disaggregation of Revenue [Line Items]
Revenues	5,044	3,601	13,534	12,245
Human Health
Disaggregation of Revenue [Line Items]
Revenues	84,981	103,466	165,827	209,481
Human Health | Finished dosage from generic drugs
Disaggregation of Revenue [Line Items]
Revenues	73,663	90,761	142,876	186,322
Human Health | Nutraceutical products
Disaggregation of Revenue [Line Items]
Revenues	11,318	12,705	22,951	23,159
Human Health | Pharmaceutical intermediates
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Human Health | Active pharmaceutical ingredients (APIs)
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Human Health | Specialty chemicals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Human Health | Agricultural protection products
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Pharmaceutical Ingredients
Disaggregation of Revenue [Line Items]
Revenues	42,042	33,629	80,890	70,205
Pharmaceutical Ingredients | Finished dosage from generic drugs
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Pharmaceutical Ingredients | Nutraceutical products
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Pharmaceutical Ingredients | Pharmaceutical intermediates
Disaggregation of Revenue [Line Items]
Revenues	12,532	9,839	22,754	19,975
Pharmaceutical Ingredients | Active pharmaceutical ingredients (APIs)
Disaggregation of Revenue [Line Items]
Revenues	29,510	23,790	58,136	50,230
Pharmaceutical Ingredients | Specialty chemicals
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Pharmaceutical Ingredients | Agricultural protection products
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Performance Chemicals
Disaggregation of Revenue [Line Items]
Revenues	36,626	34,134	81,337	76,798
Performance Chemicals | Finished dosage from generic drugs
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Performance Chemicals | Nutraceutical products
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Performance Chemicals | Pharmaceutical intermediates
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Performance Chemicals | Active pharmaceutical ingredients (APIs)
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Performance Chemicals | Specialty chemicals
Disaggregation of Revenue [Line Items]
Revenues	31,582	30,533	67,803	64,553
Performance Chemicals | Agricultural protection products
Disaggregation of Revenue [Line Items]
Revenues	$ 5,044	$ 3,601	$ 13,534	$ 12,245