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Fair Values (Narrative) (Details) (USD $)	3 Months Ended
Fair Values (Narrative) (Details) (USD $)	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013
Debt Instrument [Line Items]
Aggregate carrying amount of equity method investments	$ 17,800,000		$ 18,800,000
Impairment charges	0	0
Long-Term Debt [Member]
Debt Instrument [Line Items]
Fair value of debt	112,200,000
Debt carrying amount	100,000,000
Short-Term Debt [Member]
Debt Instrument [Line Items]
Fair value of debt	97,100,000
Debt carrying amount	$ 96,800,000

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

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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