SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for doubtful accounts:, USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Allowance for doubtful accounts:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	$ 1,041,000	$ 1,096,000	$ 870,000
Additions	516,000	177,000	342,000
(Deductions)	(291,000)	(227,000)	(128,000)
Translation Adjustments	(1,000)	(5,000)	12,000
Balance at End of Period	$ 1,265,000	$ 1,041,000	$ 1,096,000