SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for domestic and foreign income taxes	$ 49,105	$ 49,636	$ 55,062
Cash paid during the period for interest, net of amounts capitalized	21,200	1,849	3,003
Increase (decrease) in accounts payable and accrued liabilities related to capital expenditures	$ 795	$ (56,965)	$ 77,164