Operating Segment Information - Segment Revenue, Operating Income and Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total revenue	$ 17,364	$ 15,914	$ 14,415	$ 14,205	$ 15,336	$ 14,616	$ 13,604	$ 13,883	$ 61,898	$ 57,439	$ 56,132
Operating income	$ 4,266	$ 5,857	$ 3,932	$ 5,034	$ 5,434	$ 5,333	$ 3,480	$ 4,329	19,089	18,576	18,820
Depreciation and amortization									2,805	2,715	2,886
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									25,676	26,095	25,386
Operating Segments [Member] | Medical Device [Member]
Segment Reporting Information [Line Items]
Total revenue									45,944	43,068	41,153
Operating income									21,192	22,636	21,164
Depreciation and amortization									1,138	1,136	1,255
Operating Segments [Member] | In Vitro Diagnostics [Member]
Segment Reporting Information [Line Items]
Total revenue									15,954	14,371	14,979
Operating income									4,484	3,459	4,222
Depreciation and amortization									873	850	864
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income									(6,587)	(7,519)	(6,566)
Depreciation and amortization									$ 794	$ 729	$ 767