Goodwill and Other Intangible Assets (Schedule of Intangible Assets Subject to Amortization) (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	$ 355,184	$ 127,034
Accumulated Amortization	70,886	48,724
Net Book Value	284,298	78,310
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	110,787	21,761
Accumulated Amortization	13,968	7,815
Net Book Value	96,819	13,946
Trademarks
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	2,218	1,868
Accumulated Amortization	2,195	1,800
Net Book Value	23	68
Product rights and related intangibles
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	221,335	83,048
Accumulated Amortization	37,677	23,511
Net Book Value	183,658	59,537
License agreements
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	6,537	6,611
Accumulated Amortization	6,035	5,531
Net Book Value	502	1,080
EPA registrations and related data
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	14,307	13,591
Accumulated Amortization	11,011	9,927
Net Book Value	$ 3,296	3,664
Technology-based intangibles
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value		155
Accumulated Amortization		140
Net Book Value		$ 15