Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 126,574,000	$ 134,225,000	$ 242,374,000	$ 286,136,000
Point in time
Disaggregation of Revenue [Line Items]
Net sales	35,467,000	33,256,000	66,363,000	79,644,000
Over time
Disaggregation of Revenue [Line Items]
Net sales	91,107,000	100,969,000	176,011,000	206,492,000
Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	105,477,000	127,047,000	210,605,000	261,978,000
Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	21,097,000	7,178,000	31,769,000	24,158,000
U.S. government
Disaggregation of Revenue [Line Items]
Net sales	44,790,000	42,274,000	85,815,000	95,876,000
Domestic
Disaggregation of Revenue [Line Items]
Net sales	57,590,000	57,634,000	113,597,000	118,776,000
Total United States
Disaggregation of Revenue [Line Items]
Net sales	102,380,000	99,908,000	199,412,000	214,652,000
International
Disaggregation of Revenue [Line Items]
Net sales	24,194,000	34,317,000	42,962,000	71,484,000
Satellite and Space Communications
Disaggregation of Revenue [Line Items]
Net sales	73,721,000	78,603,000	132,654,000	180,991,000
Satellite and Space Communications \| Point in time
Disaggregation of Revenue [Line Items]
Net sales	34,852,000	32,571,000	65,026,000	78,312,000
Satellite and Space Communications \| Over time
Disaggregation of Revenue [Line Items]
Net sales	38,869,000	46,032,000	67,628,000	102,679,000
Satellite and Space Communications \| Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	52,624,000	71,425,000	100,885,000	156,833,000
Satellite and Space Communications \| Cost reimbursable
Disaggregation of Revenue [Line Items]
Net sales	21,097,000	7,178,000	31,769,000	24,158,000
Satellite and Space Communications \| U.S. government
Disaggregation of Revenue [Line Items]
Net sales	44,192,000	41,701,000	84,619,000	94,707,000
Satellite and Space Communications \| Domestic
Disaggregation of Revenue [Line Items]
Net sales	8,987,000	8,804,000	13,834,000	24,756,000
Satellite and Space Communications \| Total United States
Disaggregation of Revenue [Line Items]
Net sales	53,179,000	50,505,000	98,453,000	119,463,000
Satellite and Space Communications \| International
Disaggregation of Revenue [Line Items]
Net sales	20,542,000	28,098,000	34,201,000	61,528,000
Terrestrial and Wireless Networks
Disaggregation of Revenue [Line Items]
Net sales	52,853,000	55,622,000	109,720,000	105,145,000
Terrestrial and Wireless Networks \| Point in time
Disaggregation of Revenue [Line Items]
Net sales	615,000	685,000	1,337,000	1,332,000
Terrestrial and Wireless Networks \| Over time
Disaggregation of Revenue [Line Items]
Net sales	52,238,000	54,937,000	108,383,000	103,813,000
Terrestrial and Wireless Networks \| Firm fixed-price
Disaggregation of Revenue [Line Items]
Net sales	52,853,000	55,622,000	109,720,000	105,145,000
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	598,000	573,000	1,196,000	1,169,000
Terrestrial and Wireless Networks \| Domestic
Disaggregation of Revenue [Line Items]
Net sales	48,603,000	48,830,000	99,763,000	94,020,000
Terrestrial and Wireless Networks \| Total United States
Disaggregation of Revenue [Line Items]
Net sales	49,201,000	49,403,000	100,959,000	95,189,000
Terrestrial and Wireless Networks \| International
Disaggregation of Revenue [Line Items]
Net sales	$ 3,652,000	$ 6,219,000	$ 8,761,000	$ 9,956,000