Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 944
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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Guarantees (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
Guarantees (Narrative) (Details) - USD ($)	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024	Jul. 31, 2024
Advanced Filtration Systems, Inc.
Guarantor Obligations
Investment earnings	$ 3,300,000	$ 2,500,000	$ 6,200,000	$ 4,200,000
Revolving credit facility
Guarantor Obligations
Available credit facilities	63,000,000		63,000,000
Multi-Currency Revolving Credit Facility
Guarantor Obligations
Available credit facilities	17,000,000		17,000,000
Advanced Filtration Systems, Inc.
Guarantor Obligations
AFSI outstanding debt	$ 49,300,000		$ 49,300,000		$ 51,000,000.0