Employee Benefit Plans - Schedule of Changes in Accumulated Benefit Obligations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	$ 14,225	$ 15,011
Service cost	770	644	666
Interest cost	476	633	694
Actuarial (gain)/loss	(1,745)	1,104
Benefit payments	(703)	(2,062)
Plan amendments	0	(1,105)
Obligation at end of year	$ 13,023	$ 14,225	$ 15,011