Restructuring (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2010	Oct. 31, 2009	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Restructuring (Textuals) [Abstract]
Restructuring charges	$ 2,202	$ 1,211	$ 2,134	$ 3,641	$ 5,717	$ 2,347	$ 3,649	$ 3,601	$ 9,188	$ 15,314	$ 25,849
Percentage reduction in workforce through restructuring programs											25.00%
Employee Related [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									6,341	10,850	21,279
Contract termination [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									243	711	1,275
Other facility closure related cost [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									449	1,493	1,194
Asset Write-offs [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									2,155	2,260	2,101
Americas [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									5,445	7,158	13,928
Europe [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									3,340	5,350	7,730
Asia-Pacific [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges									$ 403	$ 2,806	$ 4,191