Segment Information (Details)	3 Months Ended
	Oct. 31, 2022 USD ($) ft² productArea segment	Oct. 31, 2021 USD ($)	Jul. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Segment Reporting Information, Profit (Loss)
Net sales	$ 131,139,000	$ 116,759,000
Operating income (loss)	(9,724,000)	(6,515,000)
Net income (loss)	(11,096,000)	(5,984,000)
Benefit from income taxes	(608,000)	(2,053,000)
Interest (income) and other	(255,000)	219,000
Change in fair value of convertible preferred stock purchase option liability	0	(304,000)
Interest expense	2,235,000	1,607,000
Amortization of stock-based compensation	904,000	921,000
Amortization of intangibles	5,349,000	5,349,000
Depreciation	2,798,000	2,241,000
Amortization of cost to fulfill assets	240,000	0
CEO transition costs	9,090,000	0
Proxy solicitation costs	0	2,162,000
Restructuring costs	1,325,000	712,000
COVID-19 related costs		674,000
Strategic emerging technology costs	746,000
Adjusted EBITDA	10,728,000	5,544,000
Purchases of property, plant and equipment	7,221,000	3,638,000
Total assets	$ 977,825,000	982,989,000	$ 974,297,000
Chandler, Arizona
Segment Reporting Information [Line Items]
Area of property (in sq ft) | ft²	146,000
Satellite and Space Communications
Segment Reporting Information [Line Items]
Number of product areas | productArea	4
Segment Reporting Information, Profit (Loss)
Net sales	$ 80,873,000	64,560,000
Terrestrial and Wireless Networks
Segment Reporting Information [Line Items]
Number of product areas | productArea	4
Segment Reporting Information, Profit (Loss)
Net sales	$ 50,266,000	52,199,000
Operating Segments | Satellite and Space Communications
Segment Reporting Information, Profit (Loss)
Net sales	80,873,000	64,560,000
Operating income (loss)	5,016,000	(5,313,000)
Net income (loss)	5,815,000	(5,074,000)
Benefit from income taxes	(222,000)	(599,000)
Interest (income) and other	(575,000)	247,000
Change in fair value of convertible preferred stock purchase option liability		0
Interest expense	(2,000)	114,000
Amortization of stock-based compensation	0	0
Amortization of intangibles	1,828,000	1,828,000
Depreciation	1,020,000	825,000
Amortization of cost to fulfill assets	240,000
CEO transition costs	0
Proxy solicitation costs		0
Restructuring costs	1,056,000	712,000
COVID-19 related costs		674,000
Strategic emerging technology costs	746,000
Adjusted EBITDA	9,906,000	(1,273,000)
Purchases of property, plant and equipment	4,435,000	1,037,000
Total assets	486,636,000	485,087,000
Operating Segments | Terrestrial and Wireless Networks
Segment Reporting Information, Profit (Loss)
Net sales	50,266,000	52,199,000
Operating income (loss)	744,000	6,102,000
Net income (loss)	605,000	5,978,000
Benefit from income taxes	(165,000)	141,000
Interest (income) and other	304,000	(18,000)
Change in fair value of convertible preferred stock purchase option liability		0
Interest expense	0	0
Amortization of stock-based compensation	0	0
Amortization of intangibles	3,521,000	3,521,000
Depreciation	1,737,000	1,364,000
Amortization of cost to fulfill assets	0
CEO transition costs	0
Proxy solicitation costs		0
Restructuring costs	0	0
COVID-19 related costs		0
Strategic emerging technology costs	0
Adjusted EBITDA	6,002,000	10,986,000
Purchases of property, plant and equipment	2,542,000	2,601,000
Total assets	467,594,000	471,858,000
Unallocated
Segment Reporting Information, Profit (Loss)
Net sales	0
Operating income (loss)	(15,484,000)	(7,304,000)
Net income (loss)	(17,516,000)	(6,888,000)
Benefit from income taxes	(221,000)	(1,595,000)
Interest (income) and other	16,000	(10,000)
Change in fair value of convertible preferred stock purchase option liability		(304,000)
Interest expense	2,237,000	1,493,000
Amortization of stock-based compensation		921,000
Amortization of intangibles	0	0
Depreciation	41,000	52,000
Amortization of cost to fulfill assets	0
CEO transition costs	9,090,000
Proxy solicitation costs		2,162,000
Restructuring costs	269,000	0
COVID-19 related costs		0
Strategic emerging technology costs	0
Adjusted EBITDA	(5,180,000)	(4,169,000)
Purchases of property, plant and equipment	244,000	0
Total assets	$ 23,595,000	$ 26,044,000