Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

No definition available.

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

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

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LinesOfCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Covenant, Capital Investments Permitted

+ References

No definition available.

+ Details

Name:	wdfc_DebtCovenantCapitalInvestmentsPermitted
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Covenant, Capital Investments Permitted Carryforward Limit

+ References

No definition available.

+ Details

Name:	wdfc_DebtCovenantCapitalInvestmentsPermittedCarryforwardLimit
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Covenant, Maximum Dividends As Percentage Of Net Income In Prior Four Quarters

+ References

No definition available.

+ Details

Name:	wdfc_DebtCovenantMaximumDividendsAsPercentageOfNetIncomeInPriorFourQuarters
Namespace Prefix:	wdfc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Date Of Final Required Semi-Annual Payment

+ References

No definition available.

+ Details

Name:	wdfc_DebtInstrumentDateOfFinalRequiredSemiAnnualPayment
Namespace Prefix:	wdfc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Latest Issuance Date

+ References

No definition available.

+ Details

Name:	wdfc_DebtInstrumentLatestIssuanceDate
Namespace Prefix:	wdfc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio of consolidated EBITDA to consolidated interest charges for the most recently completed four fiscal quarters.

+ References

No definition available.

+ Details

Name:	wdfc_EarningsBeforeInterestTaxesDepreciationAndAmortizationInterestCoverageRatio
Namespace Prefix:	wdfc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The ratio of consolidated funded indebtedness as of termination date to consolidated EBITDA for the most recently completed four fiscal quarters.

+ References

No definition available.

+ Details

Name:	wdfc_EarningsBeforeInterestTaxesDepreciationAndAmortizationLeverageRatio
Namespace Prefix:	wdfc_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Debt Agreements

+ References

No definition available.

+ Details

Name:	wdfc_NumberOfDebtAgreements
Namespace Prefix:	wdfc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Repayment Of Principal

+ References

No definition available.

+ Details

Name:	wdfc_RepaymentOfPrincipal
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Senior Notes, Additional Maximum Borrowing Capacity

+ References

No definition available.

+ Details

Name:	wdfc_SeniorNotesAdditionalMaximumBorrowingCapacity
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Unrecognized Tax Benefits, Reserve Accrued

+ References

No definition available.

+ Details

Name:	wdfc_UnrecognizedTaxBenefitsReserveAccrued
Namespace Prefix:	wdfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_SeventhAmendedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_AutoborrowAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_OtherUnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_AmendedAndRestatedCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_AmendedAndRestatedCreditAgreementYearOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_AmendedAndRestatedCreditAgreementYearTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_AmendedAndRestatedCreditAgreementYearThreeFourFiveAndSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=wdfc_NoteAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=wdfc_SeriesNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=wdfc_ShelfNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=wdfc_UnitedKingdomSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=wdfc_EuropeMiddleEastAfricaAndIndiaSubsidiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Narrative) (Details)		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
Debt (Narrative) (Details)	Mar. 16, 2020 USD ($)	Feb. 29, 2020 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2020 USD ($)	Aug. 31, 2020 USD ($) agreement	Sep. 30, 2020 USD ($)	Mar. 27, 2020 USD ($)	Aug. 31, 2019 USD ($)	Nov. 15, 2017 USD ($)
Debt Instrument [Line Items]
Number of agreements \| agreement					2
Additional maximum borrowing capacity							$ 80,000,000.0
Line of credit			$ 95,900,000		$ 95,900,000
Current debt			800,000		800,000			$ 21,205,000
Reserved accrued								$ 8,700,000
Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	$ 150,000,000.0	$ 100,000,000.0	150,000,000.0		150,000,000.0
Share buy-back plan, amount authorized			$ 150,000,000.0		$ 150,000,000.0
Consolidated leverage ratio			3		3
Consolidated interest coverage ratio			3		3
Maturity date					Mar. 16, 2025
Maximum dividends percentage					75.00%
Capital investments permitted, Carryforward limit	5,000,000.0
Autoborrow Agreement [Member]
Debt Instrument [Line Items]
Current debt			$ 0		$ 0
Line of credit, short-term liability			30,000,000.0		30,000,000.0
Other Unsecured Debt [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount			35,000,000.0		$ 35,000,000.0
Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Capital investments permitted, Carryforward limit		2,500,000
Amended And Restated Credit Agreement, Year 2020 [Member]
Debt Instrument [Line Items]
Capital investments permitted	30,500,000
Amended And Restated Credit Agreement, Year 2021 [Member]
Debt Instrument [Line Items]
Capital investments permitted	19,000,000.0
Amended And Restated Credit Agreement, Year 2022, 2023, 2024, and 2025 [Member]
Debt Instrument [Line Items]
Capital investments permitted	15,000,000.0
Line Of Credit [Member]
Debt Instrument [Line Items]
Line of credit, short-term liability				$ 90,000,000.0
Repayment of short-term debt			$ 55,000,000.0	$ 5,000,000.0
Note Agreement [Member]
Debt Instrument [Line Items]
Interest rate			3.39%		3.39%
Note Agreement [Member] \| Series A Notes [Member]
Debt Instrument [Line Items]
Principal amount									$ 20,000,000.0
Maturity date					Nov. 15, 2032
Principal payment frequency of periodic payment					semi-annually
Periodic payment amount					$ 400,000
Date of final semi-annual payment required					May 15, 2032
Balloon payment			$ 8,400,000		$ 8,400,000
Repayment of principal					800,000
Shelf Notes [Member]
Debt Instrument [Line Items]
Principal amount			0		0
United Kingdom Subsidiary [Member] \| Seventh Amended Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount		$ 50,000,000.0
Europe, The Middle East, Africa And India Subsidiary [Member] \| Amended And Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount	$ 100,000,000.0
Maximum [Member] \| Shelf Notes [Member]
Debt Instrument [Line Items]
Additional maximum borrowing capacity			$ 105,000,000.0		$ 105,000,000.0
Latest date to issue senior notes					Nov. 15, 2020
Period of debt issuance					15 years 6 months
Subsequent Events [Member] \| Other Unsecured Debt [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount						$ 125,000,000.0
Subsequent Events [Member] \| Shelf Notes [Member]
Debt Instrument [Line Items]
Principal amount						$ 52,000,000.0