Deferred Revenue (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Deferred Revenue
Deferred revenue, current	$ 54,451	$ 43,422
Total deferred revenue, long-term	14,000	10,976
Total deferred revenue	68,451	54,398
Deferred Revenue (Textuals) [Abstract]
Support period of deferred professional services and support revenue, Minimum, years	1 year
Support period of deferred professional services and support revenue, Maximum, years	5 years
Support period of deferred ratable product and related services and support revenue, Minimum, years	1 year
Support period of deferred ratable product and related services and support revenue, Maximum, years	3 years
Product [Member]
Deferred Revenue
Deferred revenue, current	14,356	16,087
Professional services and support [Member]
Deferred Revenue
Deferred revenue, current	39,640	27,298
Total deferred revenue, long-term	13,787	10,976
Ratable product and related services and support [Member]
Deferred Revenue
Deferred revenue, current	455	37
Total deferred revenue, long-term	$ 213	$ 0