Commitments, Contingencies and Other Matters (Narrative) (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) Entity	Jun. 30, 2016 USD ($) Entity	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2009 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Outstanding purchase obligations	$ 77,367	$ 77,367
Environmental remediation charge included in selling, general and administrative expenses		1,313	$ 1,618
Total rental expense		1,265	1,567	$ 1,576
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	1,313	1,313
Accrual for environmental loss contingencies	12,532	12,532	11,079
Arsynco, Inc | Minimum
Commitments and Contingencies Disclosure [Line Items]
Site contingency loss exposure not accrued		19,400
Arsynco, Inc | Maximum
Commitments and Contingencies Disclosure [Line Items]
Site contingency loss exposure not accrued		21,200
BASF Corporation
Commitments and Contingencies Disclosure [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	5,639	5,639	4,985
Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Amount expected to be paid for product registrations and various task force groups	1,802	1,802
Amount accrued for product registrations and various task force groups	$ 0	$ 0	$ 0
Berry's Creek Study Area | Arsynco, Inc
Commitments and Contingencies Disclosure [Line Items]
Number of potentially responsible parties | Entity	150	150