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Gain (Losses) on Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Not designated as hedging instrument [Member] | Forward exchange [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivative financial instruments that were recorded in the consolidated statement of income $ (1,302) $ 16,804 $ (4,564) $ (14,588)
Not designated as hedging instrument [Member] | Costless collar contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivative financial instruments that were recorded in the consolidated statement of income 917 (1,765) 3,172 5,850
Designated as hedging instrument [Member] | Cross currency swap [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative and non derivative instruments gain (loss) recognized in accumulated oher comprehensive income (loss) (9,632) 1,674 (12,163) 17,315
Non derivative financial instruments [Member] | Foreign denominated debt [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative and non derivative instruments gain (loss) recognized in accumulated oher comprehensive income (loss) $ 642 $ 5,287 $ (2,856) $ 16,665