Name:	osk_DebtInstrumentCovenantTermsInterestCoverageRatio
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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

The denominator of the minimum interest coverage ratio (i.e., the Company's consolidated EBITDA to the Company's consolidated cash interest expenses) required to be maintained by the entity as of the last day of any fiscal quarter.

No definition available.

Name:	osk_DebtInstrumentCovenantTermsInterestCoverageRatioMinimumDenominator
Namespace Prefix:	osk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Covenant Terms, Senior Secured Leverage Ratio

No definition available.

Name:	osk_DebtInstrumentCovenantTermsSeniorSecuredLeverageRatio
Namespace Prefix:	osk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

The denominator of the maximum senior secured leverage ratio (i.e., the ratio of Company's consolidated secured indebtedness to the Company's consolidated EBITDA) during the current quarter ended.

No definition available.

Name:	osk_DebtInstrumentCovenantTermsSeniorSecuredLeverageRatioForIntermediatePeriodMaximumDenominator
Namespace Prefix:	osk_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Covenant Terms, Senior Secured, Leverage Ratio for Intermediate Period Maximum without collateral, Denominator

No definition available.

Name:	osk_DebtInstrumentCovenantTermsSeniorSecuredLeverageRatioforIntermediatePeriodMaximumwithoutcollateralDenominator
Namespace Prefix:	osk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Covenant Terms, Senior Secured Leverage Ratio without collateral

No definition available.

Name:	osk_DebtInstrumentCovenantTermsSeniorSecuredLeverageRatiowithoutcollateral
Namespace Prefix:	osk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Debt Instrument, Dividends and Other Distributions Restrictions, Percentage of Aggregate Net Proceeds Received

No definition available.

Name:	osk_DebtInstrumentDividendsAndOtherDistributionsRestrictionsPercentageOfAggregateNetProceedsReceived
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Debt Instrument, Dividends and Other Distributions Restrictions, Percentage of Consolidated Net Deficit Deducted

No definition available.

Name:	osk_DebtInstrumentDividendsAndOtherDistributionsRestrictionsPercentageOfConsolidatedNetDeficitDeducted
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of consolidated net income of the entity and its consolidated subsidiaries for all fiscal quarters ending after the date the company entered into new credit agreement used to determine maximum dividends or other distributions paid during the fiscal year.

No definition available.

Name:	osk_DebtInstrumentDividendsAndOtherDistributionsRestrictionsPercentageOfConsolidatedNetIncomeConsidered
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The maximum leverage ratio (i.e., the ratio of the Company's consolidated indebtedness to its consolidated net income) required to be maintained by the entity as of the last day of any fiscal quarter.

No definition available.

Name:	osk_DebtInstrumentLeverageRatio
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Data Type:	xbrli:pureItemType
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Period Type:	instant

The denominator of the maximum leverage ratio (i.e., the ratio of the Company's consolidated indebtedness to its consolidated net income) required to be maintained by the entity as of the last day of any fiscal quarter.

No definition available.

Name:	osk_DebtInstrumentLeverageRatioMaximumDenominator
Namespace Prefix:	osk_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Represents the minimum fees for the letter of credit facility, expressed as a percent of the maximum amount available to be drawn against the letter of credit issued and outstanding under the credit facility.

No definition available.

Name:	osk_LetterOfCreditFeesPercentageOnAvailableBorrowingCapacityLowEndOfRange
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the maximum fees for the letter of credit facility, expressed as a percent of the maximum amount available to be drawn against each letter of credit issued and outstanding under the credit facility.

No definition available.

Name:	osk_LetterOfCreditRatePercentageOnAvailableBorrowingCapacityHighEndOfRange
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Senior Credit Agreement, Basis Spread on Variable Rate Debt. Difference between interest rate on Revolving Credit Facility and Term Loan.

No definition available.

Name:	osk_SeniorCreditAgreementBasisSpreadonVariableRateDebt
Namespace Prefix:	osk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(5))

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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

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Period Type:	instant

Amount of the required periodic payments applied to principal.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

No definition available.

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Balance Type:	credit
Period Type:	instant

Weighted average interest rate of debt outstanding.

No definition available.

Name:	us-gaap_DebtWeightedAverageInterestRate
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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Data Type:	xbrli:stringItemType
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Period Type:	duration

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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 3: http://www.xbrl.org/2003/role/presentationRef

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-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=6879938&loc=d3e572229-122910

Name:	us-gaap_LongTermDebt
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Balance Type:	credit
Period Type:	instant

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

No definition available.

Name:	us-gaap_ProceedsFromIssuanceOfDebt
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Balance Type:	debit
Period Type:	duration

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

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Namespace Prefix:
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Name:	us-gaap_DebtInstrumentAxis=osk_SeniorSecuredCreditAgreementMember
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Name:	us-gaap_DebtInstrumentAxis=osk_SeniorSecuredTermLoanMember
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