Reportable Segment and Major Customers Information - Pre-tax Earnings Table (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Corporate operating expenses	$ (2,998)	$ (2,849)	$ (11,286)	$ (7,832)
Interest income	0	3	15	137
Interest expense	(444)	(703)	(1,450)	(2,002)
Other, net	59	908	(1,515)	1,561
EARNINGS BEFORE INCOME TAXES	15,295	34,873	82,595	51,546
RADx initiative grant income	0		1,000
Operating income	15,680	34,665	84,545	51,850
Operating Segments [Member]
Operating income	18,678	37,514	95,831	59,682
Operating Segments [Member] | Diagnostics [Member]
Operating income	2,510	(1,783)	3,749	8,087
Operating Segments [Member] | Life Science [Member]
Operating income	16,129	39,305	92,015	51,564
Eliminations [Member]
Operating income	$ 39	$ (8)	$ 67	$ 31