Warranties (Details) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Summary of activity in warranty reserves
Beginning balance	$ 1,667,000	$ 2,083,000
Acquisitions	45,000
Provisions	1,893,000	2,879,000
Settlements	(2,344,000)	(3,294,000)
Foreign currency translation		(1,000)
Ending Balance	$ 1,261,000	$ 1,667,000