CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 47,953,000	$ 43,265,000	$ 39,239,000
Other comprehensive (loss) income:
Foreign currency translation, net of tax	(7,064,000)	(1,528,000)	2,695,000
Reclassification adjustment to loss on sale of business for foreign currency translation gain included in net income during the period	(1,264,000)
Unrealized holding losses on interest rate swaps arising during the period, net of tax		(30,000)	(32,000)
Reclassification adjustments to interest expense for losses on interest rate swaps included in net income during the period, net of tax		60,000	139,000
Reclassification adjustment to interest expense for ineffective hedge on interest rate swap included in net income during the period, net of tax		73,000
Total other comprehensive (loss) income, net of tax	(8,328,000)	(1,425,000)	2,802,000
Comprehensive income	$ 39,625,000	$ 41,840,000	$ 42,041,000