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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, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Deferred tax assets:        
Employee related accruals $ 7,146 $ 12,603    
Inventory 4,851 2,573    
Environmental remediation 2,280 2,208    
Net operating loss carry forwards-domestic 4,893 13,768    
Net operating loss carry forwards-foreign 4,023 4,346    
Other 11,139 7,566    
Deferred tax assets, gross 34,332 43,064    
Valuation allowance (438) (4,614) $ (26,622) $ (32,892)
Deferred tax assets, net of valuation allowance 33,894 38,450    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (9,671) (9,725)    
Other (2,004) (1,956)    
Deferred tax liabilities, net (11,675) (11,681)    
Net deferred tax asset $ 22,219 $ 26,769