Calculation of Weighted Average Common Shares and Common Equivalent Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ (8,564)	$ 3,752	$ (19,191)	$ 38,744
Less: Income allocable to unvested restricted stock		(43)		(439)
Income (loss) available to common shareholders	(8,564)	3,709	(19,191)	38,305
Reallocation of participating earnings				1
Income (loss) attributable to common shareholders for diluted earnings per share	$ (8,564)	$ 3,709	$ (19,191)	$ 38,306
Weighted average number of common share equivalents:
Common shares used in basic earnings (loss) per share	13,002,916	12,951,845	12,994,391	12,949,807
Common share equivalents outstanding related to stock options		47,962		50,296
Total weighted average common shares and common share equivalents used in diluted earnings (loss) per share	13,002,916	12,999,807	12,994,391	13,000,103
Basic	$ (0.66)	$ 0.29	$ (1.48)	$ 2.96
Diluted	$ (0.66)	$ 0.29	$ (1.48)	$ 2.95