Commitments, Contingencies and Other Matters (Narrative) (Detail) $ in Thousands	12 Months Ended
	Jun. 30, 2017 USD ($) Entity	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2009 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Outstanding purchase obligations	$ 61,381
Environmental remediation charge included in selling, general and administrative expenses	903	$ 1,313	$ 1,618
Total rental expense	1,301	1,265	$ 1,567
Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Amount expected to be paid for product registrations and various task force groups	2,357
Amount accrued for product registrations and various task force groups	0	0
Pulvair Site Group
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought	1,700
Arsynco, Inc
Commitments and Contingencies Disclosure [Line Items]
Environmental remediation charge included in selling, general and administrative expenses	903
Accrual for environmental loss contingencies	8,451	12,532
Arsynco, Inc | Minimum
Commitments and Contingencies Disclosure [Line Items]
Site contingency loss exposure not accrued	21,500
Arsynco, Inc | Maximum
Commitments and Contingencies Disclosure [Line Items]
Site contingency loss exposure not accrued	23,300
BASF Corporation
Commitments and Contingencies Disclosure [Line Items]
Gain related to partial reimbursement				$ 550
Partial reimbursement of environmental remediation costs previously expensed				550
Environmental remediation costs expensed in prior years				$ 1,200
Future remediation costs receivable	$ 3,803	$ 5,639
Berry's Creek Study Area | Arsynco, Inc
Commitments and Contingencies Disclosure [Line Items]
Number of potentially responsible parties | Entity	150