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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Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Guarantees (Narrative) (Details) - USD ($)	3 Months Ended
Guarantees (Narrative) (Details) - USD ($)	Oct. 31, 2025	Oct. 31, 2024	Jul. 31, 2025
Advanced Filtration Systems, Inc.
Guarantor Obligations
Equity earnings in unconsolidated affiliates	$ 3,000,000.0	$ 2,900,000
Revolving credit facility
Guarantor Obligations
Available credit facilities	63,000,000
Multi-Currency Revolving Credit Facility
Guarantor Obligations
Available credit facilities	17,000,000
Advanced Filtration Systems, Inc.
Guarantor Obligations
AFSI outstanding debt	$ 38,400,000		$ 43,900,000