Employee Benefit Plans - Schedule of Changes in Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	$ 3,800	$ 4,135
Service cost	0	9	$ 210
Interest cost	89	114	222
Actuarial gain	0	(38)
Benefit payments	(499)	(420)
Obligation at end of fiscal year	$ 3,390	$ 3,800	$ 4,135