Gain (Losses) on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 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	$ (488)	$ (31,392)
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	2,255	7,615
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)	(2,531)	15,641
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)	$ (3,498)	$ 11,378