SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Allowance for doubtful accounts:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	$ 2,092,000	$ 1,874,000	$ 1,265,000
Additions	15,000	464,000	706,000
(Deductions)	(223,000)	(227,000)	(95,000)
Translation Adjustments	(34,000)	(19,000)	(2,000)
Balance at End of Period	1,850,000	2,092,000	1,874,000
Reserve for excess and obsolete inventory:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	3,895,000	4,419,000	1,781,000
Additions	3,182,000	1,494,000	3,480,000
(Deductions)	(1,569,000)	(1,796,000)	(802,000)
Translation Adjustments	(118,000)	(222,000)	(40,000)
Balance at End of Period	5,390,000	3,895,000	4,419,000
Deferred tax asset valuation allowance:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	2,037,000	3,538,000	308,000
Additions	929,000	1,010,000	3,363,000
(Deductions)	(712,000)	(2,420,000)	(126,000)
Translation Adjustments	80,000	(91,000)	(7,000)
Balance at End of Period	$ 2,334,000	$ 2,037,000	$ 3,538,000