Inventories (Details)	3 Months Ended
	Oct. 31, 2024 USD ($) inventory	Oct. 31, 2023 USD ($)	Jul. 31, 2024 USD ($)
Inventory [Line Items]
Raw materials and components	$ 74,920,000		$ 72,820,000
Work-in-process and finished goods	37,330,000		38,587,000
Total inventories	112,250,000		111,407,000
Less reserve for excess and obsolete inventories	30,446,000		18,271,000
Inventories, net	81,804,000		93,136,000
Inventory directly related to long-term contracts	3,021,000		2,869,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	2,098,000		$ 2,204,000
Provision for excess and obsolete inventory	$ 12,546,000	$ 78,000
Inventory related, number of inventory written-off | inventory	70
Inventory, Work in Process, Write-down	$ 1,082,000
Cost of sales
Inventory [Line Items]
Provision for excess and obsolete inventory	$ 11,369,000