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INCOME TAXES (Details) (USD $)
12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Income before income taxes      
United States $ 77,543,000 $ 55,623,000 $ 65,848,000
Foreign 38,730,000 (12,037,000) (2,634,000)
Income before income taxes 116,273,000 43,586,000 63,214,000
Current:      
Federal 28,783,000 20,299,000 23,625,000
State 105,000 219,000 402,000
Foreign 15,222,000 1,182,000  
Total current income tax expenses 44,110,000 21,700,000 24,027,000
Deferred and others:      
Federal (1,242,000) (1,304,000) (2,396,000)
State   (114,000) 27,000
Foreign (3,894,000) (6,118,000) 199,000
Total deferred and other income tax expenses (5,136,000) (7,536,000) (2,170,000)
Total income tax expenses 38,974,000 14,164,000 21,857,000
Differences between provision for income taxes and income tax expense computed by applying federal rates      
Total expense computed by applying federal rates 40,695,000 15,255,000 22,125,000
State and Provincial income taxes, net of federal benefit 105,000 189,000 288,000
Adjustments of valuation allowance (346,000) (231,000) 783,000
Excess depletion (1,446,000) (1,642,000) (1,074,000)
Acquisition related costs   1,364,000  
Estimates for uncertain tax positions 437,000 1,568,000  
Statutory tax attributable to Non-controlling interest (2,066,000) (2,775,000) (1,053,000)
Unrealized foreign exchange gains (losses) 2,548,000 (280,000)  
Effect of foreign earnings (891,000) 915,000  
Other (62,000) (199,000) 788,000
Total income tax expenses 38,974,000 14,164,000 21,857,000
Deferred tax assets:      
Stock-based compensation 3,275,000 3,267,000  
Net operating losses 32,157,000 25,936,000  
Other deferred tax assets 5,028,000 4,963,000  
Total deferred tax assets 40,460,000 34,166,000  
Valuation allowance (3,069,000) (3,415,000)  
Net deferred tax assets 37,391,000 30,751,000  
Deferred tax liabilities:      
Mineral property basis (179,344,000) (181,740,000)  
Unrealized foreign exchange gains (5,932,000) (3,751,000)  
Other deferred tax liabilities (3,112,000) (1,107,000)  
Total deferred tax liabilities (188,388,000) (186,598,000)  
Total net deferred taxes (150,997,000) (155,847,000)  
Valuation allowances      
Valuation allowances 3,100,000 3,400,000  
Decrease in valuation allowance as a result of recognition of net operating losses and other deferred tax assets 300,000    
Net operating loss carry forwards      
Net operating loss carry forwards 127,000,000 110,000,000  
Increase in the net operating loss carry forwards attributable to non-U.S. subsidiaries accounting losses 23,000,000    
Increase in the net operating loss carry forwards attributable to non-U.S. subsidiaries accelerated tax deductions 6,000,000    
Increase in the net operating loss carry forwards offset by the utilization of net operating losses in non-U.S. subsidiaries 13,000,000    
Reconciliation of beginning and ending amount of gross unrecognized tax benefits      
Total gross unrecognized tax benefits at beginning of year 12,479,000 614,000 410,000
Additions / Reductions for tax positions of prior years 20,000 749,000 28,000
Additions / Reductions for tax positions of current year 6,337,000 11,116,000 176,000
Total amount of gross unrecognized tax benefits at end of year 18,836,000 12,479,000 614,000
Net unrecognized tax benefits      
Unrecognized tax benefits included in tax expense, recorded on additional pre-tax income from non-U.S. subsidiaries 5,900,000    
Expiration period of statute of limitations for income tax examinations (in months) 12    
Decrease in net unrecognized income tax benefits, reasonably possible in the next 12 months, upper bound 1,600,000    
Accrued income-tax-related interest and penalties $ 1,500,000 $ 600,000