Dilutive Effect of Company's Stock Options Restricted Shares and Performance Shares (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Income (loss) from continuing operations	$ (863)	$ 1,511	$ (2,205)	$ 2,665
Income (loss) from discontinued operations, net of tax	799	(85)	736	(292)
Net income (loss)	$ (64)	$ 1,426	$ (1,469)	$ 2,373
Weighted-average common shares outstanding (basic) (in shares)	5,438	5,407	5,430	5,393
Weighted-average common shares outstanding (diluted) (in shares)	5,446	5,423	5,447	5,415
Net income (loss) per share – basic
Continuing operations (in dollars per share)	$ (0.16)	$ 0.28	$ (0.41)	$ 0.49
Discontinued operations (in dollars per share)	$ 0.15	$ (0.02)	$ 0.14	$ (0.05)
Net income (in dollars per share)	$ (0.01)	$ 0.26	$ (0.27)	$ 0.44
Net income (loss) per share – diluted:
Continuing operations (in dollars per share)	$ (0.16)	$ 0.28	$ (0.41)	$ 0.49
Discontinued operations (in dollars per share)	$ 0.15	$ (0.02)	$ 0.14	$ (0.05)
Net income (in dollars per share)	$ (0.01)	$ 0.26	$ (0.27)	$ 0.44
Anti-dilutive weighted-average common shares excluded from calculation of diluted earnings per share (in shares)	20	24	14	22
Restricted shares
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities (in shares)	6	13	16	15
Performance shares
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Effect of dilutive securities (in shares)	2	3	1	7