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

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.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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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+ Details

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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_
Data Type:	xbrli:monetaryItemType
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.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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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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Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

Short-Term Borrowings and Long-Term Debt - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2024	Jul. 30, 2025
Debt Instrument
Proceeds from long-term debt			$ 858,900,000	$ 388,100,000	$ 119,700,000
Line of Credit
Debt Instrument
Borrowing capacity		$ 317,500,000	315,100,000	$ 317,500,000
New Unsecured Senior Notes Due June Twelve Two Thousand Twenty Eight \| Unsecured Notes
Debt Instrument
Proceeds from long-term debt		200,000,000.0
Unsecured Revolving Credit Facility
Debt Instrument
Borrowing capacity			63,000,000.0
Long-term remaining borrowing capacity			281,600,000
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 \| Unsecured Delayed Draw Term Loan Credit Facility
Debt Instrument
Debt instrument term	3 years
Borrowing capacity	$ 400,000,000.0
Unsecured Revolving Credit Facility \| Variable Rate Committed Revolving Credit Facility Due June Twelfth Two Thousand Thirty
Debt Instrument
Borrowing capacity		600,000,000.0		$ 600,000,000.0		$ 500,000,000.0
Unsecured Revolving Credit Facility \| New Unsecured Senior Notes Due June Twelve Two Thousand Twenty Eight
Debt Instrument
Borrowing capacity		350,000,000.0		350,000,000.0		$ 250,000,000.0
Multi-currency revolving credit facility
Debt Instrument
Borrowing capacity			$ 17,000,000.0
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