Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Components and changes in accumulated other comprehensive (loss) income
Balance	$ 454,370,000
Balance	460,424,000
Accumulated Other Comprehensive Income
Components and changes in accumulated other comprehensive (loss) income
Balance	(11,795,000)	$ 1,224,000
Balance	(18,316,000)	397,000
Foreign Currency Translation Adjustments
Components and changes in accumulated other comprehensive (loss) income
Other comprehensive loss for foreign currency translation	$ (6,521,000)	$ (827,000)