Segment Information - Net Income Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total profit from reportable segments	$ 220,365	$ 191,992	$ 171,658
Unallocated amounts:
Administrative costs	(27,353)	(24,865)	(19,814)
Asset Impairment Charges	0	0	(13,821)
Investment and other income	244	4,333	5,079
Interest expense	(1,276)	(437)	(2,166)
Income before income taxes and losses of unconsolidated affiliate	191,980	171,023	140,936
Identification Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total profit from reportable segments	197,125	169,238	150,639
Unallocated amounts:
Asset Impairment Charges			(2,792)
Workplace Safety
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total profit from reportable segments	$ 23,240	$ 22,754	21,019
Unallocated amounts:
Asset Impairment Charges			$ (11,029)