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Restructuring (Details Textuals) (Employee Severance And Relocation, USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2011
Employee Severance And Relocation
Restructuring Cost and Reserve [Line Items]
Company recognized restructuring-related costs	$ 1.5

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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