Gain (Losses) on Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 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	$ (5,724)	$ 11,031	$ (10,288)	$ (3,557)
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	(5,047)	(1,252)	(1,875)	4,598
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)	6,106	(6,633)	(6,057)	10,682
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)	$ 8,021	$ (1,268)	$ 5,165	$ 15,397