Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 126,787,000	$ 128,076,000	$ 369,161,000	$ 414,212,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	37,882,000	25,386,000	104,245,000	105,030,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	88,905,000	102,690,000	264,916,000	309,182,000
Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	113,312,000	117,322,000	323,917,000	379,300,000
Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	13,475,000	10,754,000	45,244,000	34,912,000
U.S. government
Disaggregation of Revenue [Line Items]
Net sales	32,419,000	44,139,000	118,234,000	140,015,000
Domestic
Disaggregation of Revenue [Line Items]
Net sales	64,715,000	61,567,000	178,312,000	180,343,000
Total United States
Disaggregation of Revenue [Line Items]
Net sales	97,134,000	105,706,000	296,546,000	320,358,000
International
Disaggregation of Revenue [Line Items]
Net sales	29,653,000	22,370,000	72,615,000	93,854,000
Satellite and Space Communications
Disaggregation of Revenue [Line Items]
Net sales	67,566,000	71,445,000	200,220,000	252,436,000
Satellite and Space Communications | Point in time
Disaggregation of Revenue [Line Items]
Net sales	37,682,000	25,257,000	102,708,000	103,569,000
Satellite and Space Communications | Over time
Disaggregation of Revenue [Line Items]
Net sales	29,884,000	46,188,000	97,512,000	148,867,000
Satellite and Space Communications | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	54,091,000	60,691,000	154,976,000	217,524,000
Satellite and Space Communications | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	13,475,000	10,754,000	45,244,000	34,912,000
Satellite and Space Communications | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	31,790,000	43,546,000	116,409,000	138,253,000
Satellite and Space Communications | Domestic
Disaggregation of Revenue [Line Items]
Net sales	10,085,000	11,569,000	23,919,000	36,325,000
Satellite and Space Communications | Total United States
Disaggregation of Revenue [Line Items]
Net sales	41,875,000	55,115,000	140,328,000	174,578,000
Satellite and Space Communications | International
Disaggregation of Revenue [Line Items]
Net sales	25,691,000	16,330,000	59,892,000	77,858,000
Terrestrial and Wireless Networks
Disaggregation of Revenue [Line Items]
Net sales	59,221,000	56,631,000	168,941,000	161,776,000
Terrestrial and Wireless Networks | Point in time
Disaggregation of Revenue [Line Items]
Net sales	200,000	129,000	1,537,000	1,461,000
Terrestrial and Wireless Networks | Over time
Disaggregation of Revenue [Line Items]
Net sales	59,021,000	56,502,000	167,404,000	160,315,000
Terrestrial and Wireless Networks | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	59,221,000	56,631,000	168,941,000	161,776,000
Terrestrial and Wireless Networks | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Terrestrial and Wireless Networks | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	629,000	593,000	1,825,000	1,762,000
Terrestrial and Wireless Networks | Domestic
Disaggregation of Revenue [Line Items]
Net sales	54,630,000	49,998,000	154,393,000	144,018,000
Terrestrial and Wireless Networks | Total United States
Disaggregation of Revenue [Line Items]
Net sales	55,259,000	50,591,000	156,218,000	145,780,000
Terrestrial and Wireless Networks | International
Disaggregation of Revenue [Line Items]
Net sales	$ 3,962,000	$ 6,040,000	$ 12,723,000	$ 15,996,000