Gain (Losses) on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Not Designated as Hedging Instrument [Member] | Forward exchange contract
Derivative Instruments, Gain (Loss)
Gains (losses) on derivative financial instruments that were recorded in the consolidated statement of income	$ 462	$ (595)	$ 479	$ (624)
Not Designated as Hedging Instrument [Member] | Costless collar contracts
Derivative Instruments, Gain (Loss)
Gains (losses) on derivative financial instruments that were recorded in the consolidated statement of income	(24)	3,729	(1,364)	6,720
Designated as Hedging Instrument [Member] | Cross currency swap
Derivative Instruments, Gain (Loss)
Derivative and non derivative instruments gain (loss) recognized in accumulated oher comprehensive income (loss)	10,233	(4,852)	22,128	(11,488)
Designated as Hedging Instrument [Member] | Foreign denominated debt
Derivative Instruments, Gain (Loss)
Derivative and non derivative instruments gain (loss) recognized in accumulated oher comprehensive income (loss)	$ 9,255	$ (296)	$ 25,145	$ (6,882)