Operating Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Total revenue	$ 14,415us-gaap_Revenues	$ 13,604us-gaap_Revenues	$ 28,620us-gaap_Revenues	$ 27,487us-gaap_Revenues
Operating income	3,932us-gaap_OperatingIncomeLoss	3,480us-gaap_OperatingIncomeLoss	8,966us-gaap_OperatingIncomeLoss	7,809us-gaap_OperatingIncomeLoss
Depreciation and amortization	706	684	1,389	1,380
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	5,627	5,915	12,240	11,913
Operating Segments [Member] \| Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue	10,562	10,482	21,198	21,031
Operating income	4,696	5,282	10,212	10,610
Depreciation and amortization	295	287	565	581
Operating Segments [Member] \| In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue	3,853	3,122	7,422	6,456
Operating income	931	633	2,028	1,303
Depreciation and amortization	216	213	430	427
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income	(1,695)	(2,435)	(3,274)	(4,104)
Depreciation and amortization	$ 195	$ 184	$ 394	$ 372

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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