Segment Information - Summary of financial results for reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	$ 62,076	$ 66,775	$ 122,712	$ 127,236
Operating Income (Loss)	2,494	5,961	4,952	9,677
Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	0	0	0	0
Operating Income (Loss)	(2,068)	(1,325)	(4,058)	(3,277)
NAI | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	19,814	22,780	39,284	45,151
Operating Income (Loss)	(185)	176	(869)	876
NAI | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	348	546	681	1,198
INI | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	26,425	26,051	51,799	49,350
Operating Income (Loss)	2,227	3,796	4,987	6,485
INI | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	3,560	3,992	7,036	8,617
Global Test and Measurement | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	15,837	17,944	31,629	32,735
Operating Income (Loss)	2,520	3,314	4,892	5,592
Intercompany sales	114	161	192	436
Global Test and Measurement | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	$ 279	$ 258	$ 979	$ 668