Reportable Segments and Major Customers Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
NET REVENUES	$ 51,737	$ 50,140	$ 160,471	$ 151,074
Operating income	8,735	4,304	24,474	28,575
Goodwill	54,776		54,776		$ 54,926
Other intangible assets, net	23,975		23,975		26,704
Total assets	253,983		253,983		249,777
Goodwill impairment charge		6,628		6,628
Magellan [Member]
Segment Reporting Information [Line Items]
Goodwill impairment charge		6,628		6,628
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
NET REVENUES	36,368	35,949	113,640	107,529
Operating income	7,166	914	22,926	17,152
Goodwill	35,213		35,213		35,213
Other intangible assets, net	22,749		22,749		24,973
Total assets	183,233		183,233		180,226
Net revenues	80	71	281	278
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
NET REVENUES	15,369	14,191	46,831	43,545
Operating income	3,647	3,388	10,007	11,226
Goodwill	19,563		19,563		19,713
Other intangible assets, net	1,226		1,226		1,731
Total assets	71,375		71,375		69,938
Net revenues	96	129	363	361
Unallocated Costs and Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income	(2,078)	2	(8,459)	197
Total assets	(625)		(625)		$ (387)
Net revenues	(176)	$ (200)	(644)	$ (639)
Unallocated Costs [Member]
Segment Reporting Information [Line Items]
Executive transition and realignment costs, and litigation costs	$ 2,081		$ 8,475