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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

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