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Fair Values (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Jul. 31, 2012
Debt Instrument [Line Items]
Aggregate carrying amount of equity method investments	$ 19.7	$ 20.1
Long-term Debt [Member]
Debt Instrument [Line Items]
Fair value of debt	132.8
Debt carrying amount	118.0
Short-term Debt [Member]
Debt Instrument [Line Items]
Fair value of debt	83.2
Debt carrying amount	$ 80.0

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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