Accrued Expenses (Schedule of Components of Accrued Expenses) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Payables And Accruals [Abstract]
Accrued compensation	$ 7,351	$ 6,043
Accrued environmental remediation costs-current portion	2,058	1,933
Reserve for price concessions	10,139	5,633
Other accrued expenses	19,423	11,312
Accrued expenses	$ 38,971	$ 24,921