Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Retirement and Profit Sharing Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and other postretirement benefit expense	$ 14,158	$ 14,395	$ 13,750
Accrued retirement and profit-sharing contributions	3,342	3,844
Deferred Compensation Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation arrangement with individual, recorded liability	15,744	14,383
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated pension obligation	5,314	5,383
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	329	194
Periodic postretirement benefit cost	$ 418	$ 341	$ 665