Segment Information (Details)	3 Months Ended		6 Months Ended
	Jan. 31, 2023 USD ($) ft²	Jan. 31, 2022 USD ($)	Jan. 31, 2023 USD ($) ft² segment productArea	Jan. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Segment Reporting Information, Profit (Loss)
Net sales	$ 133,725,000	$ 120,381,000	$ 264,864,000	$ 237,140,000
Operating income (loss)	(781,000)	(24,590,000)	(10,505,000)	(31,105,000)
Net income (loss)	(4,805,000)	(21,874,000)	(15,901,000)	(27,858,000)
Benefit from income taxes	(222,000)	(3,276,000)	(830,000)	(5,329,000)
Interest (income) and other	455,000	(30,000)	200,000	189,000
Change in fair value of convertible preferred stock purchase option liability	0	(398,000)	0	(702,000)
Interest expense	3,791,000	988,000	6,026,000	2,595,000
Amortization of stock-based compensation	1,268,000	1,983,000	2,172,000	2,904,000
Amortization of intangibles	5,349,000	5,349,000	10,698,000	10,698,000
Depreciation	2,967,000	2,334,000	5,765,000	4,575,000
Amortization of cost to fulfill assets	240,000		480,000	0
CEO transition costs	0	13,554,000	9,090,000	13,554,000
Restructuring costs	1,543,000	1,726,000	2,868,000	2,438,000
COVID-19 related costs		355,000		1,029,000
Proxy solicitation costs	0	9,086,000	0	11,248,000
Strategic emerging technology costs	738,000		1,484,000
Adjusted EBITDA	11,324,000	9,797,000	22,052,000	15,341,000
Purchases of property, plant and equipment	2,697,000	5,173,000	9,918,000	8,811,000
Total assets	$ 983,672,000	994,854,000	$ 983,672,000	994,854,000	$ 974,297,000
Chandler, Arizona
Segment Reporting Information [Line Items]
Area of property (in sq ft) | ft²	146,000		146,000
Satellite and Space Communications
Segment Reporting Information [Line Items]
Number of product areas | productArea			4
Segment Reporting Information, Profit (Loss)
Net sales	$ 80,407,000	69,180,000	$ 161,280,000	133,740,000
Terrestrial and Wireless Networks
Segment Reporting Information [Line Items]
Number of product areas | productArea			4
Segment Reporting Information, Profit (Loss)
Net sales	53,318,000	51,201,000	$ 103,584,000	103,400,000
Operating Segments | Satellite and Space Communications
Segment Reporting Information, Profit (Loss)
Net sales	80,407,000	69,180,000	161,280,000	133,740,000
Operating income (loss)	3,327,000	(2,500,000)	8,343,000	(7,813,000)
Net income (loss)	3,123,000	(2,508,000)	8,938,000	(7,582,000)
Benefit from income taxes	(422,000)	82,000	(644,000)	(517,000)
Interest (income) and other	597,000	(80,000)	22,000	167,000
Change in fair value of convertible preferred stock purchase option liability		0		0
Interest expense	29,000	6,000	27,000	120,000
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	1,828,000	1,828,000	3,656,000	3,656,000
Depreciation	1,010,000	773,000	2,030,000	1,598,000
Amortization of cost to fulfill assets	240,000		480,000
CEO transition costs		0	0	0
Restructuring costs	1,089,000	1,726,000	2,145,000	2,438,000
COVID-19 related costs		355,000		1,029,000
Proxy solicitation costs		0		0
Strategic emerging technology costs	738,000		1,484,000
Adjusted EBITDA	8,232,000	2,182,000	18,138,000	909,000
Purchases of property, plant and equipment	119,000	3,187,000	4,554,000	4,224,000
Total assets	486,426,000	482,989,000	486,426,000	482,989,000
Operating Segments | Terrestrial and Wireless Networks
Segment Reporting Information, Profit (Loss)
Net sales	53,318,000	51,201,000	103,584,000	103,400,000
Operating income (loss)	3,312,000	6,856,000	4,056,000	12,958,000
Net income (loss)	3,563,000	6,965,000	4,168,000	12,943,000
Benefit from income taxes	(116,000)	(209,000)	(281,000)	(68,000)
Interest (income) and other	(135,000)	100,000	169,000	82,000
Change in fair value of convertible preferred stock purchase option liability		0		0
Interest expense	0	0	0
Amortization of stock-based compensation	0	0	0	0
Amortization of intangibles	3,521,000	3,521,000	7,042,000	7,042,000
Depreciation	1,921,000	1,510,000	3,658,000	2,874,000
Amortization of cost to fulfill assets	0		0
CEO transition costs		0	0	0
Restructuring costs	0	0	0	0
COVID-19 related costs		0		0
Proxy solicitation costs		0		0
Strategic emerging technology costs	0		0
Adjusted EBITDA	8,754,000	11,887,000	14,756,000	22,873,000
Purchases of property, plant and equipment	2,414,000	1,986,000	4,956,000	4,587,000
Total assets	471,358,000	485,155,000	471,358,000	485,155,000
Unallocated
Segment Reporting Information, Profit (Loss)
Net sales	0	0	0	0
Operating income (loss)	(7,420,000)	(28,946,000)	(22,904,000)	(36,250,000)
Net income (loss)	(11,491,000)	(26,331,000)	(29,007,000)	(33,219,000)
Benefit from income taxes	316,000	(3,149,000)	95,000	(4,744,000)
Interest (income) and other	(7,000)	(50,000)	9,000	(60,000)
Change in fair value of convertible preferred stock purchase option liability		(398,000)		(702,000)
Interest expense	3,762,000	982,000	5,999,000	2,475,000
Amortization of stock-based compensation	1,268,000	1,983,000		2,904,000
Amortization of intangibles	0	0	0	0
Depreciation	36,000	51,000	77,000	103,000
Amortization of cost to fulfill assets	0		0
CEO transition costs		13,554,000	9,090,000	13,554,000
Restructuring costs	454,000	0	723,000	0
COVID-19 related costs		0		0
Proxy solicitation costs		9,086,000		11,248,000
Strategic emerging technology costs	0		0
Adjusted EBITDA	(5,662,000)	(4,272,000)	(10,842,000)	(8,441,000)
Purchases of property, plant and equipment	164,000	0	408,000	0
Total assets	$ 25,888,000	$ 26,710,000	$ 25,888,000	$ 26,710,000