SUMMARY OF QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details 12) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended									12 Months Ended			3 Months Ended									12 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2013 Interim Financial Information	Mar. 31, 2013 Interim Financial Information	Dec. 31, 2012 Interim Financial Information	Jun. 30, 2012 Interim Financial Information	Mar. 31, 2012 Interim Financial Information	Dec. 31, 2011 Interim Financial Information	Jun. 30, 2011 Interim Financial Information	Mar. 31, 2011 Interim Financial Information	Dec. 31, 2010 Interim Financial Information	Sep. 30, 2013 Foreign currency forwards	Sep. 30, 2012 Foreign currency forwards	Sep. 30, 2011 Foreign currency forwards	Jun. 30, 2013 Foreign currency forwards Interim Financial Information	Mar. 31, 2013 Foreign currency forwards Interim Financial Information	Dec. 31, 2012 Foreign currency forwards Interim Financial Information	Jun. 30, 2012 Foreign currency forwards Interim Financial Information	Mar. 31, 2012 Foreign currency forwards Interim Financial Information	Dec. 31, 2011 Foreign currency forwards Interim Financial Information	Jun. 30, 2011 Foreign currency forwards Interim Financial Information	Mar. 31, 2011 Foreign currency forwards Interim Financial Information	Dec. 31, 2010 Foreign currency forwards Interim Financial Information	Sep. 30, 2013 Forward starting swap	Sep. 30, 2012 Forward starting swap	Jun. 30, 2013 Forward starting swap Interim Financial Information	Mar. 31, 2013 Forward starting swap Interim Financial Information	Dec. 31, 2012 Forward starting swap Interim Financial Information
Derivative instruments and hedging activities
Gains (losses) recognized in OCI	$ 5,811	$ 372	$ (8,643)	$ 7,529	$ (1,126)	$ (930)	$ 177	$ (623)	$ (4,949)	$ (357)	$ (8,323)	$ (5,635)	$ 4,581	$ 463	$ (8,643)	$ 5,912	$ (1,435)	$ (457)	$ 177	$ (623)	$ (4,949)	$ (357)	$ (8,323)	$ (5,635)	$ 1,230	$ (91)	$ 1,617	$ 309	$ (473)
Gains (losses) reclassified into earnings - Effective Portion	$ (1,231)	$ (6,860)	$ (1,663)	$ 289	$ 20	$ (2,072)	$ 2,158	$ (5,681)	$ (3,165)	$ (941)	$ (279)	$ 958	$ (1,231)	$ (6,860)	$ (1,663)	$ 289	$ 20	$ (2,072)	$ 2,158	$ (5,681)	$ (3,165)	$ (941)	$ (279)	$ 958