Operating Segments - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 13,604	$ 13,695	$ 27,487	$ 27,546
Operating income	3,480	4,129	7,809	9,006
Depreciation and amortization	684	724	1,380	1,446
Medical Device [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	287	311	581	628
In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	213	218	427	433
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	5,915	6,052	11,913	12,643
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue	10,482	9,735	21,031	20,266
Operating income	5,282	4,785	10,610	10,625
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue	3,122	3,960	6,456	7,280
Operating income	633	1,267	1,303	2,018
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income	(2,435)	(1,923)	(4,104)	(3,637)
Depreciation and amortization	$ 184	$ 195	$ 372	$ 385