Inventories (Details)	3 Months Ended	6 Months Ended
	Jan. 31, 2025 USD ($)	Jan. 31, 2025 USD ($) inventory	Jan. 31, 2024 USD ($)	Jul. 31, 2024 USD ($)
Inventory [Line Items]
Raw materials and components	$ 70,600,000	$ 70,600,000		$ 72,820,000
Work-in-process and finished goods	38,324,000	38,324,000		38,587,000
Total inventories	108,924,000	108,924,000		111,407,000
Less reserve for excess and obsolete inventories	27,523,000	27,523,000		18,271,000
Inventories, net	81,401,000	81,401,000		93,136,000
Inventory directly related to long-term contracts	3,026,000	3,026,000		2,869,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	2,028,000	2,028,000		$ 2,204,000
Provision for excess and obsolete inventory		$ 13,534,000	$ 1,473,000
Inventory related, number of inventory written-off | inventory		70
Inventory, Work in Process, Write-down	1,082,000	$ 1,082,000
Cost of sales
Inventory [Line Items]
Provision for excess and obsolete inventory	$ 11,369,000