Inventories (Details) - USD ($)	Oct. 31, 2015	Jul. 31, 2015
Inventory Disclosure [Abstract]
Raw materials and components	$ 51,058,000	$ 51,272,000
Work-in-process and finished goods	28,565,000	27,700,000
Total inventories	79,623,000	78,972,000
Less reserve for excess and obsolete inventories	16,730,000	16,904,000
Inventories, net	62,893,000	62,068,000
Inventory directly related to long-term contracts	2,152,000	2,261,000
Inventory related to contracts from third party commercial customers who outsource their manufacturing to us	$ 854,000	$ 609,000