Accrued Expenses (Schedule of Components of Accrued Expenses) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued compensation	$ 6,043	$ 4,892
Accrued environmental remediation costs-current portion	1,933	1,964
Customers advance payments	58	5,044
Reserve for price concessions	5,633	4,506
Other accrued expenses	11,254	15,613
Accrued expenses	$ 24,921	$ 32,019