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Guarantees (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Jul. 31, 2021
Guarantor Obligations
Contingent liability for standby letters of credit issued under the Company’s revolving credit facility	$ 7.5		$ 7.7
Amounts drawn for letters of credit under the Company’s revolving credit facility	0.0		0.0
Investment earnings	1.2	$ 2.0
Advanced Filtration Systems, Inc.
Guarantor Obligations
AFSI outstanding debt (the Company guarantees half)	$ 38.6		$ 37.8

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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