Line Of Credit Facility, Additional Borrowing Capacity Under Certain Conditions

No definition available.

Name:	dci_LineOfCreditFacilityAdditionalBorrowingCapacityUnderCertainConditions
Namespace Prefix:	dci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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+ Details

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Period Type:	duration

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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Short-Term Borrowings and Long-Term Debt (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023	Jul. 30, 2025
Debt Instrument
Proceeds from long-term debt		$ 388,100,000	$ 119,700,000	$ 189,200,000
Line of Credit
Debt Instrument
Borrowing capacity	$ 317,500,000	317,500,000	$ 303,400,000
Unsecured Senior Notes Due June 2028 \| Unsecured Notes
Debt Instrument
Amount	200,000,000	200,000,000
New Unsecured Senior Notes Due June Twelve Two Thousand Twenty Eight \| Unsecured Notes
Debt Instrument
Proceeds from long-term debt	200,000,000
Unsecured Revolving Credit Facility
Debt Instrument
Borrowing capacity	63,000,000	63,000,000
Long-term remaining borrowing capacity	532,100,000	$ 532,100,000
Unsecured Revolving Credit Facility \| Minimum
Debt Instrument
Commitment fee (as a percent)		0.08%
Unsecured Revolving Credit Facility \| Maximum
Debt Instrument
Commitment fee (as a percent)		0.25%
Unsecured Revolving Credit Facility \| Variable Rate Committed Revolving Credit Facility Due June Twelfth Two Thousand Thirty
Debt Instrument
Borrowing capacity	600,000,000	$ 600,000,000			$ 500,000,000
Unsecured Revolving Credit Facility \| New Unsecured Senior Notes Due June Twelve Two Thousand Twenty Eight
Debt Instrument
Borrowing capacity	350,000,000	350,000,000			$ 250,000,000
Multi-currency revolving credit facility
Debt Instrument
Borrowing capacity	17,000,000	17,000,000
Multi-currency revolving credit facility \| Line of Credit
Debt Instrument
Additional borrowing capacity on line of credit under certain conditions	$ 350,000,000.0	$ 350,000,000.0