Inventories (Details) - USD ($)	Jul. 31, 2016	Jul. 31, 2015
Inventory Disclosure [Abstract]
Raw materials and components	$ 54,723,000	$ 51,272,000
Work-in-process and finished goods	32,829,000	27,700,000
Total Inventories	87,552,000	78,972,000
Less reserve for excess and obsolete inventories	16,198,000	16,904,000
Inventories, net	71,354,000	62,068,000
Inventory directly related to long-term contracts	2,896,000	2,261,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 1,428,000	$ 609,000