Summary of Significant Accounting Policies (Details) (Conversion Services Agreement)	0 Months Ended
Nov. 17, 2006
Conversion Services Agreement
Revenue Recognition
Term of agreement to provide conversion services	20 years

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