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Restructuring (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012 Severance	Jan. 31, 2012 Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring-related costs	$ 3.1	$ 0.6	$ 1.1	$ 2.0

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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