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Guarantees (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Guarantor Obligations [Line Items]
Outstanding debt of joint venture	$ 200.7
Contingent liability for standby letters of credit, issued and outstanding	10.9
Advanced Filtration Systems, Inc. [Member]
Guarantor Obligations [Line Items]
Outstanding debt of joint venture	30.2
Joint venture investment earnings	0.7	0.7
Royalty income	$ 1.6	$ 1.7

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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