Employee Benefit Plans - Additional Information (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2015 USD ($) yr Age Rate	Jul. 31, 2014 USD ($) Rate	Jul. 31, 2013 USD ($) Rate
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement age on credited service | yr	55
Period of credited service	15 years
Minimum age for accrual credit service | Age	40
Plan amendments	$ (1,935)	$ (1,011)
Effect of plan amendment on accumulated benefit obligation	4,490
Curtailment gain	4,296	$ 0	$ 0
Decrease in accumulated benefit obligation due to change in participation assumptions	3,408
Actuarial gain that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	(646)
Prior service cost that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	$ (1,035)
Weighted average discount rate used in determining accumulated postretirement benefit obligation | Rate	3.00%	3.50%	4.00%
Accumulated pension obligation	$ 4,135	$ 8,056	$ 13,023
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(7,690)	(9,971)
Periodic postretirement benefit cost	(5,837)	740	996
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated pension obligation	6,020	4,553
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	1,361	1,228
Periodic postretirement benefit cost	724	286	388
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	2,743	2,938
Pension and other postretirement benefit expense	9,912	10,830	$ 10,110
Deferred Compensation Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation arrangement with individual, recorded liability	$ 18,321	$ 18,694