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INCOME TAXES Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2016
Jul. 31, 2015
Deferred Tax Asset    
Depreciation $ 0 $ 0
Deferred compensation 4,684 3,936
Postretirement benefits 11,935 8,242
Allowance for doubtful accounts 172 237
Deferred marketing expenses 365  
Deferred marketing expenses   0
Other assets 923 41
Accrued expenses 3,100 1,949
Tax credits 1,060 1,545
Amortization 216 37
Inventories 247 512
Depletion 0 0
Stock-based compensation 252 162
Reclamation 364 283
Other assets - foreign 890 1,006
Valuation allowance (1,170) (2,210)
Total deferred tax assets 23,038 15,740
Deferred Tax Liability    
Depreciation 5,924 6,749
Deferred compensation 0 0
Postretirement benefits 0 0
Allowance for doubtful accounts 0 0
Deferred marketing expenses 0 (19)
Other liabilities 0 0
Accrued expenses 0 0
Tax credits 0 0
Amortization 0 0
Inventories 0 0
Depletion 476 473
Stock-based compensation 0 0
Reclamation 0 0
Other assets - foreign 0 0
Valuation allowance 0 0
Total deferred tax liabilities $ 6,400 $ 7,241