Environmental Remediation (Narrative) (Detail) $ in Thousands	12 Months Ended
	Jun. 30, 2017 USD ($) Entity	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2009 USD ($)
Site Contingency [Line Items]
Environmental remediation charge included in selling, general and administrative expenses	$ 903	$ 1,313	$ 1,618
Pulvair Site Group
Site Contingency [Line Items]
Loss contingency, damages sought value	1,700
Arsynco, Inc
Site Contingency [Line Items]
Accrual for environmental loss contingencies	8,451	12,532
Environmental remediation charge included in selling, general and administrative expenses	903
Arsynco, Inc | Minimum
Site Contingency [Line Items]
Site contingency loss exposure not accrued	21,500
Arsynco, Inc | Maximum
Site Contingency [Line Items]
Site contingency loss exposure not accrued	$ 23,300
Arsynco, Inc | Berry's Creek Study Area
Site Contingency [Line Items]
Number of potentially responsible parties | Entity	150
BASF Corporation
Site Contingency [Line Items]
Partial reimbursement of environmental remediation costs previously expensed				$ 550
Gain related to partial reimbursement				550
Environmental remediation costs expensed in prior years				$ 1,200
Future remediation costs receivable	$ 3,803	$ 5,639