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Restructuring (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012 Severance	Apr. 30, 2012 Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 300	$ 300	$ 1,389	$ 2,100

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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