Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 115,800,000	$ 151,911,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	30,896,000	46,388,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	84,904,000	105,523,000
Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	105,128,000	134,931,000
Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	10,672,000	16,980,000
U.S. government
Disaggregation of Revenue [Line Items]
Net sales	41,025,000	53,602,000
Domestic
Disaggregation of Revenue [Line Items]
Net sales	56,007,000	61,142,000
Total United States
Disaggregation of Revenue [Line Items]
Net sales	97,032,000	114,744,000
International
Disaggregation of Revenue [Line Items]
Net sales	18,768,000	37,167,000
Satellite and Space Communications
Disaggregation of Revenue [Line Items]
Net sales	58,933,000	102,388,000
Satellite and Space Communications | Point in time
Disaggregation of Revenue [Line Items]
Net sales	30,174,000	45,741,000
Satellite and Space Communications | Over time
Disaggregation of Revenue [Line Items]
Net sales	28,759,000	56,647,000
Satellite and Space Communications | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	48,261,000	85,408,000
Satellite and Space Communications | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	10,672,000	16,980,000
Satellite and Space Communications | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	40,427,000	53,006,000
Satellite and Space Communications | Domestic
Disaggregation of Revenue [Line Items]
Net sales	4,847,000	15,952,000
Satellite and Space Communications | Total United States
Disaggregation of Revenue [Line Items]
Net sales	45,274,000	68,958,000
Satellite and Space Communications | International
Disaggregation of Revenue [Line Items]
Net sales	13,659,000	33,430,000
Terrestrial and Wireless Networks
Disaggregation of Revenue [Line Items]
Net sales	56,867,000	49,523,000
Terrestrial and Wireless Networks | Point in time
Disaggregation of Revenue [Line Items]
Net sales	722,000	647,000
Terrestrial and Wireless Networks | Over time
Disaggregation of Revenue [Line Items]
Net sales	56,145,000	48,876,000
Terrestrial and Wireless Networks | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	56,867,000	49,523,000
Terrestrial and Wireless Networks | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	0	0
Terrestrial and Wireless Networks | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	598,000	596,000
Terrestrial and Wireless Networks | Domestic
Disaggregation of Revenue [Line Items]
Net sales	51,160,000	45,190,000
Terrestrial and Wireless Networks | Total United States
Disaggregation of Revenue [Line Items]
Net sales	51,758,000	45,786,000
Terrestrial and Wireless Networks | International
Disaggregation of Revenue [Line Items]
Net sales	$ 5,109,000	$ 3,737,000