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Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of August 1	$ 16,946	$ 18,794	$ 18,144
Increases related to current year tax positions	1,844	2,036	1,592
Prior year tax positions:
Prior year increase	1,474	618	519
Prior year decrease		(952)	(531)
Cash settlement		(452)
Lapse of statute of limitations	(3,086)	(3,098)	(930)
Balance at July 31	$ 17,178	$ 16,946	$ 18,794

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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