Information Regarding Segments of Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Net sales:
Net sales from continuing operations	$ 29,594	$ 30,143	$ 58,294	$ 54,869
Operating income (loss):
Operating income (loss) from continuing operations	1,959	2,252	3,406	3,427
Interest expense (income), net	70	130	171	220
Foreign currency exchange (gain) loss, net	(7)	10	0	(3)
Other income, net	(109)	(117)	(186)	(234)
Consolidated income from continuing operations before income tax provision	2,005	2,229	3,421	3,444
Depreciation and amortization expense:
Consolidated depreciation and amortization expense	1,467	1,524	2,987	3,104
LIFO expense for the Forged Components Group	(229)	269	(407)	428
Forged Components Group
Net sales:
Net sales from continuing operations	28,004	28,162	55,448	50,850
Operating income (loss):
Operating income (loss) from continuing operations	3,735	3,607	7,283	5,794
Depreciation and amortization expense:
Consolidated depreciation and amortization expense	1,298	1,363	2,662	2,792
Turbine Component Services and Repair Group
Net sales:
Net sales from continuing operations	1,590	1,981	2,846	4,019
Operating income (loss):
Operating income (loss) from continuing operations	(554)	(328)	(1,098)	(461)
Depreciation and amortization expense:
Consolidated depreciation and amortization expense	80	87	161	164
Corporate unallocated expenses
Operating income (loss):
Operating income (loss) from continuing operations	(1,222)	(1,027)	(2,779)	(1,906)
Depreciation and amortization expense:
Consolidated depreciation and amortization expense	$ 89	$ 74	$ 164	$ 148