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Segment Information (Details)
 12 Months Ended
Jul. 31, 2024
USD ($)
ft²
operating_segment
Jul. 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | operating_segment 2    
Segment Reporting Information, Profit (Loss)      
Net sales $ 540,403,000 $ 549,994,000 $ 486,239,000
Operating (loss) income (79,890,000) (14,660,000) (33,752,000)
Net (loss) income (99,985,000) (26,899,000) (33,052,000)
Provision for (benefit from) income taxes (295,000) (3,948,000) (4,023,000)
Interest expense 22,153,000 14,961,000 5,031,000
Interest (income) and other 678,000 1,226,000 (703,000)
Change in fair value of convertible preferred stock purchase option liability 0 0 1,005,000
Write-off of deferred financing costs 1,832,000 0 0
Change in fair value of warrants and derivatives (4,273,000) 0 0
Amortization of stock-based compensation 6,096,000 10,107,000 7,767,000
Amortization of intangibles 21,154,000 21,396,000 21,396,000
Depreciation 12,159,000 11,922,000 10,314,000
Impairment of long-lived assets, including goodwill 64,525,000 0 0
Amortization of cost to fulfill assets 960,000 959,000 469,000
CEO transition costs 2,916,000 9,090,000 13,554,000
Restructuring costs 12,470,000 10,852,000 5,965,000
COVID-19 related costs     1,105,000
Strategic emerging technology costs 4,110,000 3,833,000 1,197,000
Loss on business divestiture 1,199,000 0 0
Proxy solicitation costs 0 0 11,248,000
Adjusted EBITDA 45,699,000 (53,499,000) (39,263,000)
Purchases of property, plant and equipment 13,083,000 18,311,000 19,619,000
Total assets $ 912,434,000 996,237,000 974,297,000
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 $ 324,069,000 337,756,000 279,678,000
Terrestrial and Wireless Networks      
Segment Reporting Information, Profit (Loss)      
Net sales 216,334,000 212,238,000 206,561,000
Operating Segments | Satellite and Space Communications      
Segment Reporting Information, Profit (Loss)      
Net sales 324,069,000 337,756,000 279,678,000
Operating (loss) income (54,202,000) 15,041,000 (5,671,000)
Net (loss) income (55,491,000) 15,539,000 (3,852,000)
Provision for (benefit from) income taxes 666,000 (1,724,000) (1,120,000)
Interest expense 25,000 2,000 98,000
Interest (income) and other 598,000 1,224,000 (797,000)
Change in fair value of convertible preferred stock purchase option liability     0
Write-off of deferred financing costs 0    
Change in fair value of warrants and derivatives 0    
Amortization of stock-based compensation 0 0 0
Amortization of intangibles 6,685,000 7,312,000 7,312,000
Depreciation 3,867,000 4,121,000 4,049,000
Impairment of long-lived assets, including goodwill 64,525,000    
Amortization of cost to fulfill assets 960,000 959,000 469,000
CEO transition costs 0 0 0
Restructuring costs 3,822,000 5,725,000 5,666,000
COVID-19 related costs     1,105,000
Strategic emerging technology costs 4,110,000 3,833,000 1,197,000
Loss on business divestiture 0    
Proxy solicitation costs     0
Adjusted EBITDA 29,767,000 (36,991,000) (14,127,000)
Purchases of property, plant and equipment 2,890,000 7,244,000 8,915,000
Total assets 421,780,000 515,449,000 487,235,000
Operating Segments | Terrestrial and Wireless Networks      
Segment Reporting Information, Profit (Loss)      
Net sales 216,334,000 212,238,000 206,561,000
Operating (loss) income 21,670,000 12,323,000 18,925,000
Net (loss) income 20,955,000 12,297,000 18,796,000
Provision for (benefit from) income taxes 669,000 (193,000) 19,000
Interest expense 0 0 0
Interest (income) and other 46,000 219,000 110,000
Change in fair value of convertible preferred stock purchase option liability     0
Write-off of deferred financing costs 0    
Change in fair value of warrants and derivatives 0    
Amortization of stock-based compensation 0 0 0
Amortization of intangibles 14,469,000 14,084,000 14,084,000
Depreciation 7,927,000 7,637,000 6,069,000
Impairment of long-lived assets, including goodwill 0    
Amortization of cost to fulfill assets 0 0 0
CEO transition costs 0 0 0
Restructuring costs 605,000 1,220,000 0
COVID-19 related costs     0
Strategic emerging technology costs 0 0 0
Loss on business divestiture 0    
Proxy solicitation costs     0
Adjusted EBITDA 44,671,000 (35,264,000) (39,078,000)
Purchases of property, plant and equipment 8,569,000 10,075,000 10,704,000
Total assets 456,425,000 460,034,000 461,443,000
Unallocated      
Segment Reporting Information, Profit (Loss)      
Net sales 0 0 0
Operating (loss) income (47,358,000) (42,024,000) (47,006,000)
Net (loss) income (65,449,000) (54,735,000) (47,996,000)
Provision for (benefit from) income taxes (1,630,000) (2,031,000) (2,922,000)
Interest expense 22,128,000 14,959,000 4,933,000
Interest (income) and other 34,000 (217,000) (16,000)
Change in fair value of convertible preferred stock purchase option liability     1,005,000
Write-off of deferred financing costs 1,832,000    
Change in fair value of warrants and derivatives (4,273,000)    
Amortization of stock-based compensation   10,107,000 7,767,000
Amortization of intangibles 0 0 0
Depreciation 365,000 164,000 196,000
Impairment of long-lived assets, including goodwill 0    
Amortization of cost to fulfill assets 0 0 0
CEO transition costs 2,916,000 9,090,000 13,554,000
Restructuring costs 8,043,000 3,907,000 299,000
COVID-19 related costs     0
Strategic emerging technology costs 0 0 0
Loss on business divestiture 1,199,000    
Proxy solicitation costs     11,248,000
Adjusted EBITDA (28,739,000) 18,756,000 13,942,000
Purchases of property, plant and equipment 1,624,000 992,000 0
Total assets $ 34,229,000 $ 20,754,000 $ 25,619,000