Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan amendments	$ 0	$ (1,935)
Effect of plan amendment on accumulated benefit obligation		4,490
Curtailment gain	0	$ 4,296	$ 0
Actuarial gain that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	$ (544)
Weighted average discount rate used in determining accumulated postretirement benefit obligation	2.50%	3.00%	3.50%
Accumulated pension obligation	$ 3,800	$ 4,135	$ 8,056
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(6,048)	(7,690)
Periodic postretirement benefit cost	(1,558)	(5,837)	740
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated pension obligation	7,120	6,020
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	1,161	1,361
Periodic postretirement benefit cost	795	724	286
Retirement and Profit Sharing Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued retirement and profit-sharing contributions	3,380	2,743
Pension and other postretirement benefit expense	10,407	9,912	$ 10,830
Deferred Compensation Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation arrangement with individual, recorded liability	$ 18,758	$ 18,321