Warranties (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Summary of activity in warranty reserves
Beginning balance	$ 1,967,000	$ 1,697,000	$ 1,740,000	$ 1,589,000
Acquisitions		1,000	28,000	118,000
Provisions	1,505,000	452,000	3,264,000	1,758,000
Settlements	(887,000)	(552,000)	(2,365,000)	(1,833,000)
Foreign currency translation	9,000	5,000	(73,000)	(29,000)
Ending balance	$ 2,594,000	$ 1,603,000	$ 2,594,000	$ 1,603,000