Accrued Expenses (Schedule of Components of Accrued Expenses) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Payables And Accruals [Abstract]
Accrued compensation	$ 7,940	$ 7,351
Accrued environmental remediation costs-current portion	1,828	2,058
Reserve for price concessions	24,884	10,139
Accrued income taxes payable	6,403	3,956
Other accrued expenses	20,409	15,467
Accrued expenses	$ 61,464	$ 38,971