Reportable Segment and Major Customers Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Segment Reporting Information [Line Items]
NET REVENUES	$ 51,480	$ 52,283
Operating income	10,551	8,061
Goodwill	54,403		$ 54,637
Other intangible assets, net	22,265		23,113
Total assets	249,857		251,377
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
NET REVENUES	36,665	37,490
Operating income	8,786	8,569
Goodwill	35,213		35,213
Other intangible assets, net	21,386		22,068
Total assets	178,863		180,978
Net revenues	163	121
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
NET REVENUES	14,815	14,793
Operating income	5,129	2,943
Goodwill	19,190		19,424
Other intangible assets, net	879		1,045
Total assets	71,283		70,341
Net revenues	176	192
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income	(3,391)	(3,555)
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income	27	104
Total assets	(289)		$ 58
Net revenues	$ (339)	$ (313)