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Income Taxes - Components of Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Deferred Tax Assets    
Net Operating Loss Carryforwards $ 85,659 $ 77,198
Inventory Valuation and Reserves 20,428 18,865
Pension Benefits 24,824 42,432
Other Postretirement Benefits 5,959 7,111
Accrued Employee Benefits 11,234 17,069
Other Accrued Liabilities 8,609 9,229
Hedging Activities 5,409 5,507
Tax Credit and Other Carryforwards 41,039 30,733
Deferred Tax Assets, Goodwill and Intangible Assets 14,947 21,575
Total 218,108 229,719
Valuation Allowance (116,770) (122,699)
Total Deferred Tax Assets 101,338 107,020
Deferred Tax Liabilities    
Tax Depreciation in Excess of Book 83,258 83,412
Deferred Tax Liabilities, Other 4,614 149
Total Deferred Tax Liabilities 87,872 83,561
Total Net Deferred Tax Liabilities $ 13,466 $ 23,459