Name:	hayn_AdditionalVolumeOfTitaniumThatCanBeConvertedUponExerciseOfOptionByServiceReceiver
Namespace Prefix:	hayn_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

Represents the aggregate annual volume of titanium metal conversion services to be provided by the entity as agreed under the agreement.

No definition available.

Name:	hayn_AggregateAnnualVolumeOfTitaniumToBeConvertedUnderConversionServicesContract
Namespace Prefix:	hayn_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

Represents the term of agreement to provide conversion services entered into by the entity.

No definition available.

Name:	hayn_AgreementToProvideConversionServicesTerm
Namespace Prefix:	hayn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents a commitment to loan the entity funds for capital expenditures contingent upon exercising an option for incremental titanium conversion services.

No definition available.

Name:	hayn_ContingentLoanCommitment
Namespace Prefix:	hayn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the period during which revenue from rendering of conversion services is recognized.

No definition available.

Name:	hayn_DeferredRevenueRevenueRecognitionPeriod
Namespace Prefix:	hayn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the amount of liquidated damages under the default provisions of the agreement.

No definition available.

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

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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

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.

No definition available.

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

Amount of revenue recognized that was previously reported as deferred or unearned revenue.