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Income Taxes - Tax effects of significant temporary differences of deferred tax assets and liabilities (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Deferred tax assets:        
Employee related accruals $ 9,778 $ 12,417    
Inventory 3,889 2,303    
Environmental remediation 2,155 2,306    
Net operating loss carry forwards-domestic 13,641 19,183    
Net operating loss carry forwards-foreign 4,127 8,729    
Other 5,418 7,237    
Deferred tax assets, gross 39,008 52,175    
Valuation allowance (26,622) (32,892) $ (27,753) $ (36,763)
Deferred tax assets, net of valuation allowance 12,386 19,283    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (11,088) (13,428)    
Unrealized foreign exchange gains   (4,680)    
Other (461) (131)    
Deferred tax liabilities, net (11,549) (18,239)    
Net deferred tax asset (liability) $ 837 $ 1,044