Employee Benefit Plans - Schedule of Changes in Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of fiscal year	$ 3,390	$ 3,800
Service cost	0	0	$ 9
Interest cost	79	89	114
Defined Benefit Plan, Benefit Obligation, Benefits Paid	449	499
Obligation at end of fiscal year	$ 3,020	$ 3,390	$ 3,800