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

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum ratio for coverage of fixed charge.

+ References

No definition available.

+ Details

Name:	wnc_FixedChargeCoverageRatio
Namespace Prefix:	wnc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility Accordion Feature Increase Limit

+ References

No definition available.

+ Details

Name:	wnc_LineofCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	wnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Excess Availability Applied to Principal, Commitment Percentage

+ References

No definition available.

+ Details

Name:	wnc_LineofCreditFacilityExcessAvailabilityAppliedtoPrincipalCommitmentPercentage
Namespace Prefix:	wnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Excess Availability, Commitment Percentage, Threshold

+ References

No definition available.

+ Details

Name:	wnc_LineofCreditFacilityExcessAvailabilityCommitmentPercentageThreshold
Namespace Prefix:	wnc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of liquidity position to meet the future obligations for the entity.

+ References

No definition available.

+ Details

Name:	wnc_LiquidityPositionToMeetFutureObligationsAmount
Namespace Prefix:	wnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=wnc_RevolvingCreditAgreementMember
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_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DEBT Revolving Credit (Details)	Dec. 21, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Liquidity position to meet future obligations, amount		$ 319,100,000	$ 322,200,000
Revolving Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 175,000,000
Line of credit facility accordion feature increase limit	$ 275,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.20%
Fixed charge coverage ratio	1
Line of credit facility, excess availability, commitment percentage, threshold	10.00%
Revolving Credit Agreement \| Maximum
Debt Instrument [Line Items]
Line of credit facility, excess availability applied to principal, commitment percentage	15.00%
Revolving Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Revolving Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Revolving Credit Agreement \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.25%
Revolving Credit Agreement \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Bridge Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 17,500,000