Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 128,076,000	$ 136,316,000	$ 414,212,000	$ 401,180,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	25,386,000	31,138,000	105,030,000	154,151,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	102,690,000	105,178,000	309,182,000	247,029,000
Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	117,322,000	122,077,000	379,300,000	367,994,000
Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	10,754,000	14,239,000	34,912,000	33,186,000
U.S. government
Disaggregation of Revenue [Line Items]
Net sales	44,139,000	39,634,000	140,015,000	121,580,000
Domestic
Disaggregation of Revenue [Line Items]
Net sales	61,567,000	59,701,000	180,343,000	183,361,000
Total United States
Disaggregation of Revenue [Line Items]
Net sales	105,706,000	99,335,000	320,358,000	304,941,000
International
Disaggregation of Revenue [Line Items]
Net sales	22,370,000	36,981,000	93,854,000	96,239,000
Satellite and Space Communications
Disaggregation of Revenue [Line Items]
Net sales	71,445,000	82,249,000	252,436,000	243,529,000
Satellite and Space Communications | Point in time
Disaggregation of Revenue [Line Items]
Net sales	25,257,000	30,870,000	103,569,000	152,157,000
Satellite and Space Communications | Over time
Disaggregation of Revenue [Line Items]
Net sales	46,188,000	51,379,000	148,867,000	91,372,000
Satellite and Space Communications | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	60,691,000	68,010,000	217,524,000	210,343,000
Satellite and Space Communications | Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	10,754,000	14,239,000	34,912,000	33,186,000
Satellite and Space Communications | U.S. government
Disaggregation of Revenue [Line Items]
Net sales	43,546,000	38,779,000	138,253,000	118,739,000
Satellite and Space Communications | Domestic
Disaggregation of Revenue [Line Items]
Net sales	11,569,000	12,146,000	36,325,000	41,819,000
Satellite and Space Communications | Total United States
Disaggregation of Revenue [Line Items]
Net sales	55,115,000	50,925,000	174,578,000	160,558,000
Satellite and Space Communications | International
Disaggregation of Revenue [Line Items]
Net sales	16,330,000	31,324,000	77,858,000	82,971,000
Terrestrial and Wireless Networks
Disaggregation of Revenue [Line Items]
Net sales	56,631,000	54,067,000	161,776,000	157,651,000
Terrestrial and Wireless Networks | Point in time
Disaggregation of Revenue [Line Items]
Net sales	129,000	268,000	1,461,000	1,994,000
Terrestrial and Wireless Networks | Over time
Disaggregation of Revenue [Line Items]
Net sales	56,502,000	53,799,000	160,315,000	155,657,000
Terrestrial and Wireless Networks | Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	56,631,000	54,067,000	161,776,000	157,651,000
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	593,000	855,000	1,762,000	2,841,000
Terrestrial and Wireless Networks | Domestic
Disaggregation of Revenue [Line Items]
Net sales	49,998,000	47,555,000	144,018,000	141,542,000
Terrestrial and Wireless Networks | Total United States
Disaggregation of Revenue [Line Items]
Net sales	50,591,000	48,410,000	145,780,000	144,383,000
Terrestrial and Wireless Networks | International
Disaggregation of Revenue [Line Items]
Net sales	$ 6,040,000	$ 5,657,000	$ 15,996,000	$ 13,268,000