Segment Reporting and Sales by Major Customer - Professional Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2026	Jul. 31, 2025
Segment Reporting [Line Items]
Revenues from customers	$ 30,781	$ 20,125
Interest expense	418	523
Depreciation and amortization	1,771	1,703
Operating income (loss)	7,424	4,667
Gaming
Segment Reporting [Line Items]
Revenues from customers	9,041	8,811
Interest expense	326	415
Depreciation and amortization	691	774
Operating income (loss)	1,925	1,782
Aircraft Modification
Segment Reporting [Line Items]
Revenues from customers	16,301	5,642
Interest expense	86	98
Depreciation and amortization	1,026	877
Operating income (loss)	4,318	714
Aircraft Avionics
Segment Reporting [Line Items]
Revenues from customers	537	1,437
Interest expense	0	0
Depreciation and amortization	13	7
Operating income (loss)	(123)	498
Special Mission Electronics
Segment Reporting [Line Items]
Revenues from customers	4,902	4,235
Interest expense	6	10
Depreciation and amortization	28	30
Operating income (loss)	2,089	1,957
Other
Segment Reporting [Line Items]
Revenues from customers	0	0
Interest expense	0	0
Depreciation and amortization	13	15
Operating income (loss)	$ (785)	$ (284)