OTHER COMPREHENSIVE INCOME (LOSS) (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Tax on net unrealized gains/(losses) arising during the period	$ (260)	$ (2,292)	$ (691)
Net unrealized gains/(losses) arising during the period, net of tax (expense)/benefit of $(260), $(2,292) and $(691) in 2012, 2011 and 2010, respectively	56	4,076	4,880
Reclassification adjustment for gain included in net earnings	(5,952)	0	(2,879)
Net amount, Unrealized investment gains/(losses), net of reclassification adjustment	$ (5,896)	$ 4,076	$ 2,001