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Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of August 1	$ 18,794	$ 18,144	$ 15,965
Increases related to current year tax positions	2,036	1,592	4,514
Prior year tax positions:
Prior year increase	618	519	74
Prior year decrease	(952)	(531)	(532)
Cash settlement	(452)		(302)
Lapse of statute of limitations	(3,098)	(930)	(1,575)
Balance at July 31	$ 16,946	$ 18,794	$ 18,144

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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