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Guarantees (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Guarantor Obligations [Line Items]
Contingent liability for standby letters of credit, issued and outstanding	$ 13.2		$ 13.2
Advanced Filtration Systems, Inc. [Member]
Guarantor Obligations [Line Items]
Outstanding debt of joint venture	28.5		28.5
Joint venture investment earnings		0.1	0.7	0.8
Royalty income	$ 1.3	$ 1.5	$ 3.0	$ 3.2

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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