Gain (Losses) on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
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	$ (29)	$ (488)
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	2,991	2,255
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)	(6,636)	(2,531)
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)	$ (6,586)	$ (3,498)