Reportable Segment and Major Customers Information - Segment Information (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	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net sales - Third-party	$ 50,134	$ 47,265	$ 94,928	$ 92,616
Net sales - Inter-segment
Operating income	15,666	15,253	27,292	28,344
Goodwill	23,507		23,507		23,115
Other intangible assets, net	8,841		8,841		8,057
Total assets	178,155		178,155		176,748
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
Net sales - Third-party	37,061	36,403	71,898	72,072
Net sales - Inter-segment	154	105	263	203
Operating income	12,301	12,494	21,685	23,834
Goodwill	1,250		1,250		1,250
Other intangible assets, net	2,968		2,968		1,561
Total assets	111,319		111,319		112,054
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
Net sales - Third-party	13,073	10,862	23,030	20,544
Net sales - Inter-segment	225	350	484	508
Operating income	3,306	3,046	5,567	4,680
Goodwill	22,257		22,257		21,865
Other intangible assets, net	5,873		5,873		6,496
Total assets	115,444		115,444		110,111
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales - Third-party
Net sales - Inter-segment	(379)	(455)	(747)	(711)
Operating income	59	(287)	40	(170)
Goodwill
Other intangible assets, net
Total assets	$ (48,608)		$ (48,608)		$ (45,417)