EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 7,693		$ 60,206
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	42,021		41,695
Basic earnings per common share (usd per share)	$ 0.18		$ 1.44
Diluted earnings per share
Incremental shares	218	[1]	63	[1]
Weighted average shares of common stock outstanding-diluted (in shares)	42,239		41,758
Diluted earnings (loss) per common share (usd per share)	$ 0.18	[2]	$ 1.44	[2]
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	0		0

[1] Incremental shares consist of stock options, stock awards and performance units.

[2] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for the three months ended December 31, 2013 and 2012.