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Segment Information (Details)
 12 Months Ended
Jul. 31, 2023
USD ($)
ft²
operating_segment
Jul. 31, 2022
USD ($)
Jul. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | operating_segment 2    
Segment Reporting Information, Profit (Loss)      
Net sales $ 549,994,000 $ 486,239,000 $ 581,695,000
Operating income (loss) (14,660,000) (33,752,000) (68,298,000)
Net income (loss) (26,899,000) (33,052,000) (73,480,000)
Benefit from income taxes (3,948,000) (4,023,000) (1,500,000)
Interest expense 14,961,000 5,031,000 6,821,000
Interest (income) and other 1,226,000 (703,000) (139,000)
Change in fair value of convertible preferred stock purchase option liability 0 (1,005,000) 0
Amortization of stock-based compensation 10,107,000 7,767,000 9,983,000
Amortization of intangibles 21,396,000 21,396,000 21,020,000
Depreciation 11,922,000 10,314,000 9,379,000
Amortization of cost to fulfill assets 959,000 469,000 0
Restructuring costs 10,852,000 5,965,000 2,782,000
COVID-19 related costs   1,105,000 1,046,000
Strategic emerging technology costs 3,833,000 1,197,000 315,000
CEO transition costs 9,090,000 13,554,000 0
Proxy solicitation costs 0 11,248,000 0
Acquisition plan expenses 0 0 100,292,000
Adjusted EBITDA 53,499,000 39,263,000 76,519,000
Purchases of property, plant and equipment 18,311,000 19,619,000 16,037,000
Long-lived assets acquired in connection with acquisitions     47,958,000
Total assets 996,237,000 974,297,000 993,111,000
Incremental interest expense on financing commitment letter $ 1,178,000    
Chandler, Arizona      
Segment Reporting Information, Profit (Loss)      
Area of property (in sq ft) | ft² 146,000    
Satellite and Space Communications      
Segment Reporting Information, Profit (Loss)      
Net sales $ 337,756,000 279,678,000 374,850,000
Terrestrial and Wireless Networks      
Segment Reporting Information, Profit (Loss)      
Net sales 212,238,000 206,561,000 206,845,000
Operating Segments | Satellite and Space Communications      
Segment Reporting Information, Profit (Loss)      
Net sales 337,756,000 279,678,000 374,850,000
Operating income (loss) 15,041,000 (5,671,000) 24,281,000
Net income (loss) 15,539,000 (3,852,000) 24,357,000
Benefit from income taxes (1,724,000) (1,120,000) (377,000)
Interest expense 2,000 98,000 66,000
Interest (income) and other 1,224,000 (797,000) 235,000
Change in fair value of convertible preferred stock purchase option liability   0  
Amortization of stock-based compensation 0 0 0
Amortization of intangibles 7,312,000 7,312,000 5,695,000
Depreciation 4,121,000 4,049,000 3,721,000
Amortization of cost to fulfill assets 959,000 469,000  
Restructuring costs 5,725,000 5,666,000 2,782,000
COVID-19 related costs   1,105,000 1,046,000
Strategic emerging technology costs 3,833,000 1,197,000 315,000
CEO transition costs 0 0  
Proxy solicitation costs   0  
Acquisition plan expenses     0
Adjusted EBITDA 36,991,000 14,127,000 37,840,000
Purchases of property, plant and equipment 7,244,000 8,915,000 8,456,000
Long-lived assets acquired in connection with acquisitions     47,958,000
Total assets 515,449,000 487,235,000 507,981,000
Operating Segments | Terrestrial and Wireless Networks      
Segment Reporting Information, Profit (Loss)      
Net sales 212,238,000 206,561,000 206,845,000
Operating income (loss) 12,323,000 18,925,000 25,185,000
Net income (loss) 12,297,000 18,796,000 24,396,000
Benefit from income taxes (193,000) 19,000 795,000
Interest expense 0 0 0
Interest (income) and other 219,000 110,000 (6,000)
Change in fair value of convertible preferred stock purchase option liability   0  
Amortization of stock-based compensation 0 0 0
Amortization of intangibles 14,084,000 14,084,000 15,325,000
Depreciation 7,637,000 6,069,000 5,316,000
Amortization of cost to fulfill assets 0 0  
Restructuring costs 1,220,000 0 0
COVID-19 related costs   0 0
Strategic emerging technology costs 0 0 0
CEO transition costs 0 0  
Proxy solicitation costs   0  
Acquisition plan expenses     (1,052,000)
Adjusted EBITDA 35,264,000 39,078,000 44,774,000
Purchases of property, plant and equipment 10,075,000 10,704,000 7,498,000
Long-lived assets acquired in connection with acquisitions     0
Total assets 460,034,000 461,443,000 462,877,000
Unallocated      
Segment Reporting Information, Profit (Loss)      
Net sales 0 0 0
Operating income (loss) (42,024,000) (47,006,000) (117,764,000)
Net income (loss) (54,735,000) (47,996,000) (122,233,000)
Benefit from income taxes (2,031,000) (2,922,000) (1,918,000)
Interest expense 14,959,000 4,933,000 6,755,000
Interest (income) and other (217,000) (16,000) (368,000)
Change in fair value of convertible preferred stock purchase option liability   (1,005,000)  
Amortization of stock-based compensation   7,767,000 9,983,000
Amortization of intangibles 0 0 0
Depreciation 164,000 196,000 342,000
Amortization of cost to fulfill assets 0 0  
Restructuring costs 3,907,000 299,000 0
COVID-19 related costs   0 0
Strategic emerging technology costs 0 0 0
CEO transition costs 9,090,000 13,554,000  
Proxy solicitation costs   11,248,000  
Acquisition plan expenses     101,344,000
Adjusted EBITDA (18,756,000) (13,942,000) (6,095,000)
Purchases of property, plant and equipment 992,000 0 83,000
Long-lived assets acquired in connection with acquisitions     0
Total assets $ 20,754,000 $ 25,619,000 $ 22,253,000