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Restructuring (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Restructuring (Textuals) [Abstract]
Restructuring charges	$ 0	$ 3,641
Employee Related [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges	0	2,665
Other facility closure related cost [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges	0	25
Asset Write-offs [Member]
Restructuring (Textuals) [Abstract]
Restructuring charges	$ 0	$ 951

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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