Reportable Segment and Major Customers Information - Pre-tax Earnings Table (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Operating income (loss)	$ 36,141	$ 34,201	$ 56,424	$ 68,865
Corporate operating expenses	(5,752)	(4,481)	(10,323)	(8,600)
Interest income	2	6	3	15
Interest expense	(341)	(472)	(713)	(1,006)
RADx initiative grant income	0	200	0	1,000
Other, net	733	(883)	572	(1,574)
EARNINGS BEFORE INCOME TAXES	36,535	33,052	56,286	67,300
Operating Segments [Member]
Total segment operating income	41,893	38,682	66,747	77,465
Operating Segments [Member] | Diagnostics [Member]
Operating income (loss)	1,589	2,641	(174)	1,683
Operating Segments [Member] | Life Science [Member]
Operating income (loss)	40,286	36,025	66,888	75,754
Eliminations [Member]
Operating income (loss)	$ 18	$ 16	$ 33	$ 28