Fair Value Measurements (Tables)

12 Months Ended

Jul. 31, 2016

Fair Value Measurements [Abstract]

Summary of balance of assets and liabilities measured at fair value on a recurring basis

(in thousands)	Level 1		Level 2		Level 3		Total
July 31, 2016
Assets:
Available-for-sale securities	$	12,445	$	40,504	$	—	$	52,949
July 31, 2015
Assets:
Available-for-sale securities	$	6,505	$	33,782	$	—	$	40,287
Foreign exchange forwards		—		38		—		38
Total	$	6,505	$	33,820	$	—	$	40,325
Liabilities:
Foreign exchange forwards	$	—	$	39	$	—	$	39