Segment Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2024 USD ($) ft²	Apr. 30, 2023 USD ($)	Apr. 30, 2024 USD ($) ft² productArea	Apr. 30, 2023 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Jul. 31, 2021 USD ($)
Segment Reporting Information, Profit (Loss)
Net sales	$ 128,076,000	$ 136,316,000	$ 414,212,000	$ 401,180,000
Operating income (loss)	(3,470,000)	(5,276,000)	1,589,000	(15,781,000)	$ (14,660,000)	$ (33,752,000)	$ (68,298,000)
Net income (loss)	2,795,000	(7,458,000)	(9,200,000)	(23,359,000)
Provision for (benefit from) income taxes	(5,381,000)	(2,932,000)	639,000	(3,762,000)
Interest expense	5,146,000	4,386,000	15,343,000	10,412,000
Interest (income) and other	409,000	728,000	1,246,000	928,000
Change in fair value of warrants	6,439,000	0	6,439,000	0
Amortization of stock-based compensation	404,000	4,126,000	5,238,000	6,298,000
Amortization of intangibles	5,289,000	5,349,000	15,866,000	16,047,000
Depreciation	3,121,000	2,981,000	9,073,000	8,746,000
Amortization of cost to fulfill assets	240,000	240,000	720,000	720,000
CEO transition costs	2,492,000	0	2,492,000	9,090,000
Restructuring costs	2,755,000	4,096,000	9,197,000	6,964,000
Strategic emerging technology costs	880,000	1,029,000	3,228,000	2,513,000
Loss (gain) on business divestiture, net	200,000	0	(2,013,000)	0
Adjusted EBITDA	11,911,000	12,545,000	45,390,000	34,597,000
Purchases of property, plant and equipment			8,904,000	14,873,000
Total assets	990,999,000	989,859,000	990,999,000	989,859,000	$ 996,237,000
Purchases of property, plant and equipment	$ 2,667,000	4,955,000	$ 8,904,000	14,873,000
Chandler, Arizona
Segment Reporting Information, Profit (Loss)
Area of property (in sq ft) | ft²	146,000		146,000
Satellite and Space Communications
Segment Reporting Information, Profit (Loss)
Net sales	$ 71,445,000	82,249,000	$ 252,436,000	243,529,000
Terrestrial and Wireless Networks
Segment Reporting Information [Line Items]
Number of product areas | productArea			3
Segment Reporting Information, Profit (Loss)
Net sales	56,631,000	54,067,000	$ 161,776,000	157,651,000
Operating Segments | Satellite and Space Communications
Segment Reporting Information, Profit (Loss)
Net sales	71,445,000	82,249,000	252,436,000	243,529,000
Operating income (loss)	2,796,000	37,000	14,756,000	8,380,000
Net income (loss)	1,828,000	650,000	10,672,000	9,588,000
Provision for (benefit from) income taxes	11,000	(1,188,000)	547,000	(1,832,000)
Interest expense	884,000	(25,000)	2,659,000	2,000
Interest (income) and other	73,000	600,000	878,000	622,000
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	1,671,000	1,828,000	5,014,000	5,484,000
Depreciation	1,047,000	1,027,000	2,865,000	3,057,000
Amortization of cost to fulfill assets	240,000	240,000	720,000	720,000
CEO transition costs			0	0
Restructuring costs	549,000	2,191,000	2,793,000	4,336,000
Strategic emerging technology costs	880,000	1,029,000	3,228,000	2,513,000
Loss (gain) on business divestiture, net	0		0
Adjusted EBITDA	7,183,000	6,352,000	29,376,000	24,490,000
Purchases of property, plant and equipment			1,763,000	5,660,000
Total assets	498,449,000	488,814,000	498,449,000	488,814,000
Purchases of property, plant and equipment	388,000	1,106,000
Operating Segments | Terrestrial and Wireless Networks
Segment Reporting Information, Profit (Loss)
Net sales	56,631,000	54,067,000	161,776,000	157,651,000
Operating income (loss)	5,727,000	3,160,000	17,901,000	7,216,000
Net income (loss)	5,266,000	2,902,000	17,011,000	7,070,000
Provision for (benefit from) income taxes	274,000	84,000	696,000	(197,000)
Interest expense	0	0	0	0
Interest (income) and other	187,000	174,000	194,000	343,000
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	3,618,000	3,521,000	10,852,000	10,563,000
Depreciation	1,985,000	1,921,000	5,933,000	5,579,000
Amortization of cost to fulfill assets	0	0	0	0
CEO transition costs			0	0
Restructuring costs	0	548,000	8,000	548,000
Strategic emerging technology costs	0	0	0	0
Loss (gain) on business divestiture, net	0		0
Adjusted EBITDA	11,330,000	9,150,000	34,694,000	23,906,000
Purchases of property, plant and equipment			6,175,000	8,505,000
Total assets	455,169,000	475,380,000	455,169,000	475,380,000
Purchases of property, plant and equipment	2,154,000	3,549,000
Operating Segments | Government Solutions Segment
Segment Reporting Information, Profit (Loss)
Change in fair value of warrants	0		0
CEO transition costs	0
Operating Segments | Commercial Solutions Segment
Segment Reporting Information, Profit (Loss)
Change in fair value of warrants	0		0
CEO transition costs	0
Unallocated
Segment Reporting Information, Profit (Loss)
Net sales	0	0		0
Operating income (loss)	(11,993,000)	(8,473,000)	(31,068,000)	(31,377,000)
Net income (loss)	(4,299,000)	(11,010,000)	(36,883,000)	(40,017,000)
Provision for (benefit from) income taxes	(5,666,000)	(1,828,000)	(604,000)	(1,733,000)
Interest expense	4,262,000	4,411,000	12,684,000	10,410,000
Interest (income) and other	149,000	(46,000)	174,000	(37,000)
Change in fair value of warrants	6,439,000		6,439,000
Amortization of stock-based compensation	404,000	4,126,000	5,238,000	6,298,000
Amortization of intangibles	0	0	0	0
Depreciation	89,000	33,000	275,000	110,000
Amortization of cost to fulfill assets	0	0	0	0
CEO transition costs	2,492,000		2,492,000	9,090,000
Restructuring costs	2,206,000	1,357,000	6,396,000	2,080,000
Strategic emerging technology costs	0	0	0	0
Loss (gain) on business divestiture, net	200,000		2,013,000
Adjusted EBITDA	(6,602,000)	(2,957,000)	(18,680,000)	(13,799,000)
Purchases of property, plant and equipment			966,000	708,000
Total assets	37,381,000	25,665,000	$ 37,381,000	$ 25,665,000
Purchases of property, plant and equipment	$ 125,000	$ 300,000