EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Earnings Per Share [Abstract]
Net income, as reported	$ 123,320		$ 7,693
Basic earnings per share
Weighted average shares of common stock outstanding-basic (in shares)	42,276,000		42,021,000
Basic earnings per common share (usd per share)	$ 2.92		$ 0.18
Diluted earnings per share
Incremental shares	511,000	[1]	218,000	[1]
Weighted average shares of common stock outstanding-diluted (in shares)	42,787,000		42,239,000
Diluted earnings per common share (usd per share)	$ 2.88	[2]	$ 0.18	[2]
Anti-dilutive shares excluded from the calculation of diluted earnings per share	0		0

[1] Incremental shares consist primarily of stock awards and performance shares.

[2] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for the three months ended December 31, 2014, and 2013.