Goodwill and Other Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 1,883	$ 236,970	$ 67,871
Impairment charges on goodwill	$ 235,110
Intangible assets amortization method	straight-line method
Indefinite-lived trademarks	$ 800	783
Amortization charges from acquired intangible assets	30,806	$ 22,234	$ 11,176
Estimated aggregate amortization expense for 2019	29,046
Estimated aggregate amortization expense for 2020	28,556
Estimated aggregate amortization expense for 2021	28,474
Estimated aggregate amortization expense for 2022	28,409
Estimated aggregate amortization expense for 2023	28,246
Estimated aggregate amortization expense after 2024	91,071
Impairment charges on intangible assets	$ 21,156
Customer relationships | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	7 years
Customer relationships | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	11 years
Trademarks | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	3 years
Trademarks | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	4 years
Product rights and related intangibles | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	3 years
Product rights and related intangibles | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	14 years
License agreements | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	6 years
License agreements | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	11 years
EPA registrations and related data
Goodwill and Intangible Assets Disclosure [Line Items]
Finite-lived intangible assets, estimated useful life	10 years