Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Components and changes in accumulated other comprehensive (loss) income
Balance			$ 406,633,000
Reclassification adjustment to loss on sale of business for foreign currency translation gain included in net income during the period		$ 2,206,000		$ 2,206,000
Balance	$ 447,638,000		447,638,000
Accumulated Other Comprehensive Income
Components and changes in accumulated other comprehensive (loss) income
Balance	(6,802,000)	2,052,000	1,224,000	9,552,000
Balance	(2,803,000)	1,934,000	(2,803,000)	1,934,000
Foreign Currency Translation Adjustments
Components and changes in accumulated other comprehensive (loss) income
Other comprehensive income before reclassifications, net of tax	$ 3,999,000	1,146,000	$ (4,027,000)	(6,354,000)
Foreign Currency Translation Adjustments | Reclassification adjustments
Components and changes in accumulated other comprehensive (loss) income
Reclassification adjustment to loss on sale of business for foreign currency translation gain included in net income during the period		$ (1,264,000)		$ (1,264,000)