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Accrued Expenses (Tables)
12 Months Ended
Jun. 30, 2015
Payables And Accruals [Abstract]  
Schedule of components of accrued expenses
    2015     2014  
Accrued compensation   $ 6,942     $ 7,940  
Accrued environmental remediation costs-current portion     8,084       1,828  
Reserve for price concessions     35,965       24,884  
Accrued income taxes payable     -       6,403  
Other accrued expenses     8,850       20,409  
    $ 59,841     $ 61,464