Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Components and changes in accumulated other comprehensive (loss) income
Balance			$ 454,370,000
Balance	$ 503,877,000		503,877,000
Accumulated Other Comprehensive Income
Components and changes in accumulated other comprehensive (loss) income
Balance	(15,728,000)	$ (6,802,000)	(11,795,000)	$ 1,224,000
Balance	(14,344,000)	(2,803,000)	(14,344,000)	(2,803,000)
Foreign Currency Translation Adjustments
Components and changes in accumulated other comprehensive (loss) income
Other comprehensive loss for foreign currency translation	$ 1,384,000	$ 3,999,000	$ (2,549,000)	$ (4,027,000)