Earnings Per Share ("EPS") and Cash Dividends (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings per share
Net income	$ 6,941	$ 9,460	$ 14,183	$ 20,301
Basic shares	13,132	12,976	13,077	12,755
Basic EPS	$ 0.53	$ 0.73	$ 1.08	$ 1.59
Diluted Shares	13,332	13,215	13,258	13,100
Diluted EPS	$ 0.52	$ 0.72	$ 1.07	$ 1.55
Restricted Stock [Member]
Earnings per share
Incremental shares from the assumed lapse of restrictions on restricted stock	56	59	51	61
Stock Options [Member]
Earnings per share
Incremental shares from the assumed exercise of outstanding stock options	144	180	130	284