Operating Segments - Segment Revenue, Operating Income from Continuing Operations and Depreciation and Amortization (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Total revenue									$ 56,132	$ 51,928	$ 52,756
Operating income from continuing operations	4,638	4,793	3,689	3,222	5,576	4,238	4,129	4,877	18,820	16,342	15,523
Depreciation and amortization									2,886	2,929	3,159
Medical Device [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization									1,255	1,414	1,604
In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization									864	774	799
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income from continuing operations									25,386	22,973	24,311
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue									41,153	37,883	39,606
Operating income from continuing operations									21,164	18,431	19,997
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue									14,979	14,045	13,150
Operating income from continuing operations									4,222	4,542	4,314
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income from continuing operations									(6,566)	(6,631)	(8,788)
Depreciation and amortization									$ 767	$ 741	$ 756