Reportable Segment and Major Customers Information - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net revenues	$ 63,511	$ 84,797	$ 241,692	$ 189,514
Operating income (loss)	15,680	34,665	84,545	51,850
Goodwill	115,315		115,315		$ 114,186
Other intangible assets	76,744		76,744		83,197
Total assets	446,570		446,570		405,261
Restructuring and litigation costs	438	134	2,695	1,189
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(2,998)	(2,849)	(11,286)	(7,832)
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	39	(8)	67	31
Total assets	3		3		(34)
Net revenues	(154)	(142)	(448)	(440)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	18,678	37,514	95,831	59,682
Operating Segments [Member] | Diagnostics [Member]
Segment Reporting Information [Line Items]
Net revenues	31,189	21,598	93,459	91,331
Operating income (loss)	2,510	(1,783)	3,749	8,087
Goodwill	95,267		95,267		94,855
Other intangible assets	76,743		76,743		83,179
Total assets	329,003		329,003		306,812
Net revenues	100	86	285	264
Operating Segments [Member] | Life Science [Member]
Segment Reporting Information [Line Items]
Net revenues	32,322	63,199	148,233	98,183
Operating income (loss)	16,129	39,305	92,015	51,564
Goodwill	20,048		20,048		19,331
Other intangible assets	1		1		18
Total assets	117,564		117,564		$ 98,483
Net revenues	$ 54	$ 56	$ 163	$ 176