Summary of Significant Accounting Policies Other comprehensive income, income tax (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Schedule [Line Items]
Income tax (benefit) expense	$ (4,963)	$ 42,583	$ 37,162
Other Comprehensive Income (Loss), Tax	$ 1,047	$ (2,234)	$ 11,462