Fair Value Measurements - Changes in goodwill (Detail) $ in Thousands	9 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance as of June 30, 2016	$ 67,871
Balance as of March 31, 2017	241,741
Nonrecurring basis | Level 3 inputs | Operating Segments
Goodwill [Roll Forward]
Balance as of June 30, 2016	67,871
Citron and Lucid product acquisition	173,907
Changes in foreign currency exchange rates	(37)
Balance as of March 31, 2017	241,741
Nonrecurring basis | Level 3 inputs | Operating Segments | Human Health
Goodwill [Roll Forward]
Balance as of June 30, 2016	66,039
Citron and Lucid product acquisition	173,907
Changes in foreign currency exchange rates
Balance as of March 31, 2017	239,946
Nonrecurring basis | Level 3 inputs | Operating Segments | Pharmaceutical Ingredients
Goodwill [Roll Forward]
Balance as of June 30, 2016	1,651
Citron and Lucid product acquisition
Changes in foreign currency exchange rates	(30)
Balance as of March 31, 2017	1,621
Nonrecurring basis | Level 3 inputs | Operating Segments | Performance Chemicals
Goodwill [Roll Forward]
Balance as of June 30, 2016	181
Citron and Lucid product acquisition
Changes in foreign currency exchange rates	(7)
Balance as of March 31, 2017	$ 174