Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended
	Oct. 31, 2023	Oct. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 151,911,000	$ 131,139,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	46,388,000	55,084,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	105,523,000	76,055,000
Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	134,931,000	120,141,000
Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	16,980,000	10,998,000
U.S. government
Disaggregation of Revenue [Line Items]
Net sales	53,602,000	42,051,000
Domestic
Disaggregation of Revenue [Line Items]
Net sales	61,142,000	61,255,000
Total United States
Disaggregation of Revenue [Line Items]
Net sales	114,744,000	103,306,000
International
Disaggregation of Revenue [Line Items]
Net sales	37,167,000	27,833,000
Satellite and Space Communications
Disaggregation of Revenue [Line Items]
Net sales	102,388,000	80,873,000
Satellite and Space Communications | Point in time
Disaggregation of Revenue [Line Items]
Net sales	45,741,000	55,000,000
Satellite and Space Communications | Over time
Disaggregation of Revenue [Line Items]
Net sales	56,647,000	25,873,000
Satellite and Space Communications | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	85,408,000	69,875,000
Satellite and Space Communications | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	16,980,000	10,998,000
Satellite and Space Communications | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	53,006,000	41,013,000
Satellite and Space Communications | Domestic
Disaggregation of Revenue [Line Items]
Net sales	15,952,000	15,244,000
Satellite and Space Communications | Total United States
Disaggregation of Revenue [Line Items]
Net sales	68,958,000	56,257,000
Satellite and Space Communications | International
Disaggregation of Revenue [Line Items]
Net sales	33,430,000	24,616,000
Terrestrial and Wireless Networks
Disaggregation of Revenue [Line Items]
Net sales	49,523,000	50,266,000
Terrestrial and Wireless Networks | Point in time
Disaggregation of Revenue [Line Items]
Net sales	647,000	84,000
Terrestrial and Wireless Networks | Over time
Disaggregation of Revenue [Line Items]
Net sales	48,876,000	50,182,000
Terrestrial and Wireless Networks | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	49,523,000	50,266,000
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	596,000	1,038,000
Terrestrial and Wireless Networks | Domestic
Disaggregation of Revenue [Line Items]
Net sales	45,190,000	46,011,000
Terrestrial and Wireless Networks | Total United States
Disaggregation of Revenue [Line Items]
Net sales	45,786,000	47,049,000
Terrestrial and Wireless Networks | International
Disaggregation of Revenue [Line Items]
Net sales	$ 3,737,000	$ 3,217,000