Commitments, Contingencies and Other Matters (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended				12 Months Ended
	Jun. 30, 2012 Entity	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012 Subsidiary [Member]	Jun. 30, 2011 Subsidiary [Member]	Jun. 30, 2012 Pulvair Site Group [Member]	Jun. 13, 2012 Pulvair Site Group [Member]	Jun. 30, 2012 Arsynco Inc. [Member]	Jun. 30, 2011 Arsynco Inc. [Member]	Jun. 30, 2009 BASF Corporation [Member]	Jun. 30, 2012 BASF Corporation [Member]	Jun. 30, 2011 BASF Corporation [Member]
Commitments and Contingencies Disclosure [Line Items]
Total outstanding purchase obligations	$ 72,408
Settlement sought to remediate site contamination						1,700	1,700
Site contingency loss exposure not accrued, low estimate								8,400
Site contingency loss exposure not accrued, high estimate								10,200
Accrual for environmental loss contingencies								7,566	7,962
Partial reimbursement of environmental remediation costs previously expensed										550
Environmental remediation costs expensed in prior years										1,200
Future remediation costs receivable											3,405	3,583
Number of potentially responsible parties	150
Amount expected to be paid for product registrations and various task force groups				2,822
Amount accrued for product registrations and various task force groups				242	600
Total rental expense	$ 992	$ 1,562	$ 1,840