EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Earnings available to common shares	$ 9,703	$ 10,415
Denominator:
Weighted average common shares (Denominator for basic calculation, in shares)	22,845,000	22,508,000
Weighted average effect of dilutive securities:
Share-based compensation (in shares)	813,000	418,000
Diluted weighted average common shares (Denominator for diluted calculation, in shares)	23,658,000	22,926,000
Earnings per share:
Basic (in dollars per share)	$ 0.42	$ 0.46
Diluted (in dollars per share)	$ 0.41	$ 0.45
Outstanding stock options excluded from diluted earnings (in shares)	1,700,000	1,800,000