Accrued Expenses (Schedule of Components of Accrued Expenses) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Payables And Accruals [Abstract]
Accrued compensation	$ 5,563	$ 5,793
Accrued environmental remediation costs-current portion	5,535	6,112
Reserve for price concessions	137,428	97,156
Partnered product liabilities	14,880	16,068
Other accrued expenses	17,840	9,799
Accrued expenses	$ 181,246	$ 134,928