Employee Benefit Plans - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013 Age Y	Jul. 31, 2012	Jul. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement age on credited service	55
Period of credited service	15 years
Minimum age for accrual credit service	40
Benefit payments	$ (703)	$ (2,062)
Dental and vision benefit maximum age limit for retirees	65
Plan amendments	0	(1,105)
Actuarial gain that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	244
Prior service cost that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	203
Weighted average discount rate used in determining accumulated postretirement benefit obligation liability	4.00%	3.25%	4.50%
Accumulated pension obligation	3,977	4,021
Deferred compensation arrangement with individual, recorded liability	15,769	13,738
AOCI, minimum pension liability, before tax	(807)	(828)
Periodic postretirement benefit cost	996	885	1,202
Accrued retirement and profit-sharing contributions	3,615	4,371
Pension and other postretirement benefit expense	10,110	12,569	12,875
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Periodic postretirement benefit cost	$ 388	$ 299	$ 301