Commitments, Contingencies and Other Matters (Narrative) (Detail) £ in Thousands, $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($)	Jun. 30, 2014 GBP (£)	Jun. 30, 2013 USD ($)	Jun. 30, 2009 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Outstanding purchase obligations		$ 62,159	$ 62,159
Environmental remediation charge included in selling, general and administrative expenses			1,618
Total rental expense			1,567	$ 1,576		$ 1,269
United Phosphorous Limited
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought				7,200	£ 4,500
Payment for litigation settlement	$ 350
Pulvair Site Group
Commitments and Contingencies Disclosure [Line Items]
Loss contingency, damages sought			1,700
Arsynco, Inc
Commitments and Contingencies Disclosure [Line Items]
Site contingency loss exposure not accrued, low estimate			16,500
Site contingency loss exposure not accrued, high estimate			18,300
Environmental remediation charge included in selling, general and administrative expenses		1,618	1,618
Accrual for environmental loss contingencies		$ 11,079	$ 11,079	8,907
Number of potentially responsible parties | Entity		150	150
BASF Corporation
Commitments and Contingencies Disclosure [Line Items]
Partial reimbursement of environmental remediation costs previously expensed							$ 550
Environmental remediation costs expensed in prior years							$ 1,200
Future remediation costs receivable		$ 4,985	$ 4,985	4,008
Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Amount expected to be paid for product registrations and various task force groups		1,785	1,785
Amount accrued for product registrations and various task force groups		$ 0	$ 0	$ 0