Goodwill and Other Intangible Assets (Schedule of Intangible Assets Subject to Amortization) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	$ 322,582	$ 355,184
Accumulated Amortization	88,780	70,886
Net Book Value	233,802	284,298
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	94,287	110,787
Accumulated Amortization	21,615	13,968
Net Book Value	72,672	96,819
Trademarks
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	82	2,218
Accumulated Amortization	74	2,195
Net Book Value	8	23
Product rights and related intangibles
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	212,749	221,335
Accumulated Amortization	54,094	37,677
Net Book Value	158,655	183,658
License agreements
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	937	6,537
Accumulated Amortization	866	6,035
Net Book Value	71	502
EPA registrations and related data
Goodwill and Intangible Assets Disclosure [Line Items]
Gross Carrying Value	14,527	14,307
Accumulated Amortization	12,131	11,011
Net Book Value	$ 2,396	$ 3,296