Reportable Segments and Major Customers - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Segment Reporting Information [Line Items]
NET REVENUES	$ 50,140	$ 50,665	$ 151,074	$ 149,084
Operating income	4,304	13,741	28,575	42,483
Goodwill	54,612		54,612		$ 61,982
Other intangible assets, net	27,592		27,592		29,855
Total assets	245,143		245,143		251,823
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
NET REVENUES	35,949	37,523	107,529	110,178
Operating income	914	9,886	17,152	31,412
Goodwill	35,213		35,213		42,608
Other intangible assets, net	25,745		25,745		27,534
Total assets	177,789		177,789		185,241
Net revenues	71	70	278	225
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
NET REVENUES	14,191	13,142	43,545	38,906
Operating income	3,388	3,696	11,226	11,086
Goodwill	19,399		19,399		19,374
Other intangible assets, net	1,847		1,847		2,321
Total assets	67,294		67,294		66,624
Net revenues	129	201	361	955
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income	2	159	197	(15)
Total assets	60		60		$ (42)
Net revenues	$ (200)	$ (271)	$ (639)	$ (1,180)