Disposition - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 07, 2023	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from business divestiture, net				$ 0	$ 33,225,000
Gain (loss) on disposition of business		$ 0	$ (200,000)	0	2,013,000	$ (1,199,000)
Net sales		126,787,000	128,076,000	369,161,000	414,212,000
Operating Income (Loss)		(1,532,000)	$ (3,470,000)	(140,959,000)	$ 1,589,000	(79,890,000)	$ (14,660,000)	$ (33,752,000)
Less reserve for excess and obsolete inventories		27,200,000		27,200,000		18,271,000
Solid-State RF Microwave High Power Amplifiers and Control Components Product Line | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture preliminary purchase price	$ 35,459,000
Proceeds from business divestiture, net	$ 33,277,000
CGC Technology Limited | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales						4,001,000	9,969,000	11,188,000
Operating Income (Loss)						$ 32,331,000	$ 8,203,000	$ 9,897,000
Reversed revenue				4,157,000
Reversed contract costs				1,403,000
Restructuring charges		386,000		3,226,000
Less reserve for excess and obsolete inventories		$ 2,948,000		$ 2,948,000