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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, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Deferred tax assets:        
Employee related accruals $ 4,952 $ 7,146    
Inventory 3,953 4,851    
Environmental remediation 1,341 2,280    
Net operating loss carry forwards-domestic 1,577 4,893    
Net operating loss carry forwards-foreign 3,243 4,023    
Other 9,986 11,139    
Deferred tax assets, gross 25,052 34,332    
Valuation allowance (861) (438) $ (4,614) $ (26,622)
Deferred tax assets, net of valuation allowance 24,191 33,894    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (8,957) (9,671)    
Other liabilities (1,906) (2,004)    
Deferred tax liabilities, net (10,863) (11,675)    
Net deferred tax asset $ 13,328 $ 22,219