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Fair Values (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012
Fair Values [Abstract]
Estimated fair value of long-term debt with fixed interest rates	$ 221.4
Long-term debt carrying amount	200.7
Aggregate carrying amount	$ 21.3	$ 20.1

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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