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Foreign Currencies (Details) (USD $)	3 Months Ended		6 Months Ended
Foreign Currencies (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Foreign Currencies [Abstract]
Foreign currency transaction losses	$ 0.1	$ 0.1	$ 0.1	$ 0.1

Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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