Segment Information (Details)	12 Months Ended
	Jul. 31, 2022 USD ($) ft²	Jul. 31, 2022 USD ($) ft² operating_segment	Jul. 31, 2022 USD ($) ft² segment	Jul. 31, 2022 USD ($) ft² productArea	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments		2	2
Segment Reporting Information, Profit (Loss)
Net sales	$ 486,239,000				$ 581,695,000	$ 616,715,000
Operating (loss) income	(33,752,000)				(68,298,000)	15,174,000
Net (loss) income	(33,052,000)				(73,480,000)	7,020,000
(Benefit from) provision for income taxes	(4,023,000)				(1,500,000)	2,290,000
Interest (income) and other	(703,000)				(139,000)	(190,000)
Change in fair value of convertible preferred stock purchase option liability	(1,005,000)				0	0
Interest expense	5,031,000				6,821,000	6,054,000
Amortization of stock-based compensation	7,767,000				9,983,000	9,275,000
Amortization of intangibles	21,396,000				21,020,000	21,595,000
Depreciation	10,314,000				9,379,000	10,561,000
Amortization of cost to fulfill assets	469,000
Estimated contract settlement costs						444,000
Acquisition plan expenses	0				100,292,000	20,754,000
Restructuring costs	5,965,000				2,782,000
COVID-19 related costs	1,105,000				1,046,000	0
Strategic emerging technology costs	1,197,000				315,000
Adjusted EBITDA	39,263,000				76,519,000	77,803,000
Purchases of property, plant and equipment	19,619,000				16,037,000	7,225,000
Long-lived assets acquired in connection with acquisitions					47,958,000	38,451,000
Total assets	974,297,000	$ 974,297,000	$ 974,297,000	$ 974,297,000	993,111,000	929,647,000
Proxy solicitation costs	11,248,000				0	0
CEO transition costs	13,554,000				0	0
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	146,000	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	$ 279,678,000				374,851,000	411,073,000
Terrestrial and Wireless Networks
Segment Reporting Information [Line Items]
Number of product areas | productArea				4
Segment Reporting Information, Profit (Loss)
Net sales	206,561,000				206,844,000	205,642,000
Operating Segments | Satellite and Space Communications
Segment Reporting Information, Profit (Loss)
Net sales	279,678,000				374,850,000	411,073,000
Operating (loss) income	(5,671,000)				24,281,000	25,492,000
Net (loss) income	(3,852,000)				24,357,000	25,714,000
(Benefit from) provision for income taxes	(1,120,000)				(377,000)	(29,000)
Interest (income) and other	(797,000)				235,000	(218,000)
Change in fair value of convertible preferred stock purchase option liability	0
Interest expense	98,000				66,000	25,000
Amortization of stock-based compensation	0				0	0
Amortization of intangibles	7,312,000				5,695,000	5,133,000
Depreciation	4,049,000				3,721,000	3,854,000
Amortization of cost to fulfill assets	469,000
Estimated contract settlement costs						476,000
Acquisition plan expenses					0	751,000
Restructuring costs	5,666,000				2,782,000
COVID-19 related costs	1,105,000				1,046,000
Strategic emerging technology costs	1,197,000				315,000
Adjusted EBITDA	14,127,000				37,840,000	35,706,000
Purchases of property, plant and equipment	8,915,000				8,456,000	3,801,000
Long-lived assets acquired in connection with acquisitions					47,958,000	32,391,000
Total assets	487,235,000	$ 487,235,000	$ 487,235,000	$ 487,235,000	507,981,000	412,704,000
Proxy solicitation costs	0
CEO transition costs	0
Operating Segments | Terrestrial and Wireless Networks
Segment Reporting Information, Profit (Loss)
Net sales	206,561,000				206,845,000	205,642,000
Operating (loss) income	18,925,000				25,185,000	29,316,000
Net (loss) income	18,796,000				24,396,000	28,932,000
(Benefit from) provision for income taxes	19,000				795,000	339,000
Interest (income) and other	110,000				(6,000)	18,000
Change in fair value of convertible preferred stock purchase option liability	0
Interest expense	0				0	27,000
Amortization of stock-based compensation	0				0	0
Amortization of intangibles	14,084,000				15,325,000	16,462,000
Depreciation	6,069,000				5,316,000	5,939,000
Amortization of cost to fulfill assets	0
Estimated contract settlement costs						(32,000)
Acquisition plan expenses					(1,052,000)	0
Restructuring costs	0				0
COVID-19 related costs	0				0
Strategic emerging technology costs	0				0
Adjusted EBITDA	39,078,000				44,774,000	51,685,000
Purchases of property, plant and equipment	10,704,000				7,498,000	3,097,000
Long-lived assets acquired in connection with acquisitions					0	6,060,000
Total assets	461,443,000	461,443,000	461,443,000	461,443,000	462,877,000	467,312,000
Proxy solicitation costs	0
CEO transition costs	0
Unallocated
Segment Reporting Information, Profit (Loss)
Net sales	0				0	0
Operating (loss) income	(47,006,000)				(117,764,000)	(39,634,000)
Net (loss) income	(47,996,000)				(122,233,000)	(47,626,000)
(Benefit from) provision for income taxes	(2,922,000)				(1,918,000)	1,980,000
Interest (income) and other	(16,000)				(368,000)	10,000
Change in fair value of convertible preferred stock purchase option liability	(1,005,000)
Interest expense	4,933,000				6,755,000	6,002,000
Amortization of stock-based compensation					9,983,000	9,275,000
Amortization of intangibles	0				0	0
Depreciation	196,000				342,000	768,000
Amortization of cost to fulfill assets	0
Estimated contract settlement costs						0
Acquisition plan expenses					101,344,000	20,003,000
Restructuring costs	299,000				0
COVID-19 related costs	0				0
Strategic emerging technology costs	0				0
Adjusted EBITDA	(13,942,000)				(6,095,000)	(9,588,000)
Purchases of property, plant and equipment	0				83,000	327,000
Long-lived assets acquired in connection with acquisitions					0	0
Total assets	25,619,000	$ 25,619,000	$ 25,619,000	$ 25,619,000	$ 22,253,000	$ 49,631,000
Proxy solicitation costs	11,248,000
CEO transition costs	$ 13,554,000