Reportable Segment and Major Concentrations Data - Segment Information (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
Sales Information [Line Items]
Net sales - Third-party	$ 48,962	$ 47,108	$ 47,265	$ 45,351	$ 43,483	$ 41,915	$ 47,239	$ 40,075	$ 188,686	$ 172,712	$ 158,836
Net sales - Inter-segment
Operating income									57,314	49,296	40,033
Depreciation and amortization									7,152	6,597	5,873
Capital expenditures									3,234	3,530	9,139
Goodwill	23,115				23,146				23,115	23,146	23,124
Other intangible assets	8,057				10,264				8,057	10,264	10,947
Total assets	176,748				161,381				176,748	161,381	155,493
Diagnostics [Member]
Sales Information [Line Items]
Net sales - Third-party									144,629	130,180	120,433
Net sales - Inter-segment									533	599	152
Operating income									46,735	40,648	37,698
Depreciation and amortization									4,328	3,732	2,970
Capital expenditures									2,031	2,341	5,041
Goodwill	1,250				1,250				1,250	1,250	1,381
Other intangible assets	1,561				2,239				1,561	2,239	1,604
Total assets	112,054				96,928				112,054	96,928	104,179
Life Science [Member]
Sales Information [Line Items]
Net sales - Third-party									44,057	42,532	38,403
Net sales - Inter-segment									1,223	1,097	756
Operating income									10,627	8,473	2,595
Depreciation and amortization									2,824	2,865	2,903
Capital expenditures									1,203	1,189	4,098
Goodwill	21,865				21,896				21,865	21,896	21,743
Other intangible assets	6,496				8,025				6,496	8,025	9,343
Total assets	110,111				101,706				110,111	101,706	92,467
Eliminations [Member]
Sales Information [Line Items]
Net sales - Third-party
Net sales - Inter-segment									(1,756)	(1,696)	(908)
Operating income									(48)	175	(260)
Depreciation and amortization
Capital expenditures
Goodwill
Other intangible assets
Total assets	$ (45,417)				$ (37,253)				$ (45,417)	$ (37,253)	$ (41,153)