Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenues	$ 162,295	$ 146,041	$ 334,167	$ 292,899
Cost of goods sold	127,367	116,498	264,081	230,954
Gross profit	34,928	29,543	70,086	61,945
Selling, general and administrative expenses	22,088	20,989	43,722	40,675
Research and development expenses	2,157	1,850	3,996	3,564
Amortization of intangible assets	121	413	536	828
Operating income	10,562	6,291	21,832	16,878
Other income	(507)	(1,709)	(507)	(1,709)
Interest expense	41	43	110	104
Interest income	(3)	(2)	(6)	(21)
Income from continuing operations before income taxes	11,031	7,959	22,235	18,504
Income tax provision	4,055	1,757	7,992	5,182
Income from continuing operations	6,976	6,202	14,243	13,322
Income from discontinued operations, net of tax (Note I)	8,617	616	9,604	881
Net income	$ 15,593	$ 6,818	$ 23,847	$ 14,203
Earnings per share:
Continuing operations	$ 0.58	$ 0.52	$ 1.19	$ 1.12
Discontinued operations	$ 0.72	$ 0.05	$ 0.80	$ 0.07
Basic earnings per share	$ 1.30	$ 0.57	$ 1.99	$ 1.19
Continuing operations	$ 0.58	$ 0.52	$ 1.18	$ 1.11
Discontinued operations	$ 0.71	$ 0.05	$ 0.80	$ 0.07
Diluted earnings per share	$ 1.29	$ 0.57	$ 1.98	$ 1.18
Weighted average shares:
Basic	12,004	11,953	11,999	11,946
Diluted	12,064	12,029	12,057	12,021