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Guarantees (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Guarantor Obligations [Line Items]
Outstanding debt of joint venture	$ 21.7
Joint venture investment earnings	2.0	1.6	0.4
Contingent liability for standby letters of credit, issued and outstanding	10.9	11.4
Advanced Filtration Systems, Inc. [Member]
Guarantor Obligations [Line Items]
Royalty income	$ 6.2	$ 6.2	$ 5.4

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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