SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016		Jul. 31, 2015
Allowance for doubtful accounts:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	$ 1,850	$ 2,092		$ 1,874
Additions	998	15		464
Deductions	(1,056)	(223)		(227)
Translation Adjustments	16	(34)		(19)
Balance at End of Period	1,808	1,850		2,092
Reserve for excess and obsolete inventory:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	5,390	3,895		4,419
Additions	5,016	3,182		1,494
Deductions	(1,580)	(1,569)		(1,796)
Translation Adjustments	27	(118)		(222)
Balance at End of Period	8,853	5,390		3,895
Deferred tax asset valuation allowance:
Changes in allowance for doubtful accounts
Balance at Beginning of Period	2,334	2,037		3,538
Additions	615	929		1,010	[1]
Deductions	0	(712)	[1]	(2,420)
Translation Adjustments	35	80		(91)
Balance at End of Period	$ 2,984	$ 2,334		$ 2,037

[1] The amounts primarily include deductions of valuation allowances associated with New Jersey net operating losses.