Employee Benefit Plans - Additional Information (Details) (USD $)	12 Months Ended
	Jul. 31, 2014 Y Age Rate	Jul. 31, 2013 Rate	Jul. 31, 2012 Rate
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Decrease in accumulated benefit obligation due to change in participation assumptions	$ 3,408
Retirement age on credited service	55
Period of credited service	15 years
Minimum age for accrual credit service	40
Benefit payments	(473,000)	(703,000)
Plan amendments	(1,011,000)	0
Actuarial gain that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	(869,000)
Prior service cost that will be amortized from AOCI into net periodic postretirement benefit cost over the next fiscal year	(325,000)
Weighted average discount rate used in determining accumulated postretirement benefit obligation liability	3.50%	4.00%	3.25%
Accumulated pension obligation	8,056,000	13,023,000	14,225,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	9,971,000	4,737,000
Deferred compensation arrangement with individual, recorded liability	18,694,000	15,769,000
Periodic postretirement benefit cost	740,000	996,000	885,000
Accrued retirement and profit-sharing contributions	2,938,000	3,615,000
Pension and other postretirement benefit expense	10,830,000	10,110,000	12,569,000
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated pension obligation	4,553,000	3,977,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(1,228,000)	(807,000)
Periodic postretirement benefit cost	$ 286,000	$ 388,000	$ 299,000