Warranties (Details) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Summary of activity in warranty reserves
Beginning balance	$ 1,589,000	$ 1,261,000
Acquisitions	118,000	221,000
Provisions	2,583,000	2,627,000
Settlements	(2,523,000)	(2,519,000)
Foreign currency translation	(27,000)	(1,000)
Ending balance	$ 1,740,000	$ 1,589,000