SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Allowance for doubtful accounts
Changes in allowance for doubtful accounts
Balance at Beginning of Period	$ 1,874,000	$ 1,265,000	$ 1,041,000
Additions	464,000	706,000	516,000
(Deductions)	(227,000)	(95,000)	(291,000)
Translation Adjustments	(19,000)	(2,000)	(1,000)
Balance at End of Period	2,092,000	1,874,000	1,265,000
Reserve for excess and obsolete inventory :
Changes in allowance for doubtful accounts
Balance at Beginning of Period	4,419,000	1,781,000	1,957,000
Additions	1,494,000	3,480,000	750,000
(Deductions)	(1,796,000)	(802,000)	(922,000)
Translation Adjustments	(222,000)	(40,000)	(4,000)
Balance at End of Period	3,895,000	4,419,000	1,781,000
Deferred tax asset valuation allowance
Changes in allowance for doubtful accounts
Balance at Beginning of Period	3,538,000	308,000	1,275,000
Additions	1,010,000	3,363,000	133,000
(Deductions)	(2,420,000)	(126,000)	(1,023,000)
Translation Adjustments	(91,000)	(7,000)	(77,000)
Balance at End of Period	$ 2,037,000	$ 3,538,000	$ 308,000