Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net income (loss)	$ 7,385	$ (1,745)
Denominator:
Weighted average basic shares	11,922,000	11,764,000
Dilutive effect of stock options and restricted stock units	78,000
Weighted average diluted shares with assumed conversions	12,000,000	11,764,000
Net earnings (loss) per share:
Basic	$ 0.62	$ (0.15)
Diluted	$ 0.62	$ (0.15)
Shares excluded from the computation of diluted earnings (loss) per share	104,000