Warranties (Details) - USD ($)	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Summary of activity in warranty reserves
Beginning balance	$ 1,740,000	$ 1,589,000
Acquisitions	28,000
Provisions	905,000	713,000
Settlements	(823,000)	(600,000)
Foreign currency translation	(3,000)	(13,000)
Ending balance	$ 1,847,000	$ 1,689,000