Inventories, Net (Details) - USD ($)	Jul. 31, 2016	Jul. 31, 2015
Inventories, Net
Raw materials and parts	$ 45,867,000	$ 36,585,000
Work-in-process	13,178,000	10,017,000
Finished goods	37,831,000	29,371,000
Reserve for excess and obsolete inventory	(5,390,000)	(3,895,000)
Total inventories	$ 91,486,000	$ 72,078,000