Gain (Losses) on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 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	$ (595)	$ (1,302)	$ (624)	$ (4,564)
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	3,729	917	6,720	3,172
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)	(4,852)	(9,632)	(11,488)	(12,163)
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)	$ (296)	$ 642	$ (6,882)	$ (2,856)