Maximum aggregate amount of annual dividends which the Company may pay before certain financial metrics must be met.

No definition available.

Name:	hayn_DebtInstrumentCovenantMaximumAmountOfDividendPriorToFinancialMetricsRequirement
Namespace Prefix:	hayn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the maximum excess availability percentage.

+ References

No definition available.

+ Details

Name:	hayn_DebtInstrumentFixedChargeCoverageRatioCovenantExcessAvailabilityPercentMaximum
Namespace Prefix:	hayn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility permitted under the amended agreement at the request of borrowers.

+ References

No definition available.

+ Details

Name:	hayn_LineOfCreditFacilityIncreasedMaximumBorrowingCapacityAtBorrowersRequest
Namespace Prefix:	hayn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility subject to a borrowing base formula and certain reserves that could limit the entity’s borrowing under the facility.

+ References

No definition available.

+ Details

Name:	hayn_LineOfCreditFacilityMaximumBorrowingCapacitySubjectToBorrowingBaseFormulaAndCertainReserves
Namespace Prefix:	hayn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the percentage of the equity interest in direct foreign subsidiaries pledged as collateral for borrowings under the line of credit facility arrangement.

+ References

No definition available.

+ Details

Name:	hayn_LineOfCreditFacilityPercentageOfEquityInterestInDirectForeignSubsidiariesPledgedAsCollateral
Namespace Prefix:	hayn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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://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 2: 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)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCredit
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 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:	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_LineOfCreditFacilityLineItems
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://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

+ Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_ForeignLineOfCreditMember
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:

Debt (Details) £ in Thousands, $ in Thousands	12 Months Ended
Debt (Details) £ in Thousands, $ in Thousands	Sep. 30, 2015 USD ($)	Jul. 11, 2011 USD ($)	Apr. 30, 2008 GBP (£)	Apr. 30, 2008 USD ($)
Debt
Outstanding balance	$ 0
Domestic Line of Credit
Debt
Maximum revolving loan amount under the Amended Agreement		$ 120,000
Limited borrowing capacity		105,000
Increased maximum revolving loan amount at the request of the borrowers		$ 170,000
Outstanding balance	$ 0
Commitment fee (as a percent)	0.25%
Excess availability, percentage, maximum	12.50%
Percentage of equity interest in direct foreign subsidiaries pledged as collateral for borrowings	65.00%
Domestic Line of Credit \| Maximum \| Prime rate
Debt
Basis spread on variable rate (as a percent)	0.75%
Domestic Line of Credit \| Maximum \| Eurodollar rate
Debt
Basis spread on variable rate (as a percent)	2.00%
Foreign Line of Credit
Debt
Maximum revolving loan amount under the Amended Agreement			£ 2,000	$ 3,026
Letter of Credit
Debt
Commitment fee (as a percent)	1.50%
Maximum aggregate amount of annual dividends which the Company may pay before certain financial metrics must be met	$ 20,000