Reportable Segment and Major Customers Information - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net revenues	$ 111,231	$ 85,264	$ 199,572	$ 178,181
Operating income (loss)	36,141	34,201	56,424	68,865
Goodwill	114,039		114,039		$ 114,668
Other intangible assets, net	79,058		79,058		84,151
Total assets	471,810		471,810		449,722
Litigation costs	508	1,030	789	2,257
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(5,752)	(4,481)	(10,323)	(8,600)
Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	(145)	(207)	(234)	(294)
Operating income (loss)	18	16	33	28
Total assets	(34)		(34)		(22)
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
Net revenues	41,103	31,949	74,307	62,270
Net revenues	113	116	147	185
Operating income (loss)	1,589	2,641	(174)	1,683
Goodwill	94,528		94,528		94,904
Other intangible assets, net	79,056		79,056		84,149
Total assets	355,754		355,754		339,208
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
Net revenues	70,128	53,315	125,265	115,911
Net revenues	32	91	87	109
Operating income (loss)	40,286	$ 36,025	66,888	$ 75,754
Goodwill	19,511		19,511		19,764
Other intangible assets, net	2		2		2
Total assets	$ 116,090		$ 116,090		$ 110,536