New Accounting Pronouncements (Details)	3 Months Ended
Jun. 30, 2013 item
New Accounting Pronouncements
Number of new accounting pronouncements applicable to the company issued	0

Represents the number of new accounting pronouncements applicable to the entity issued during the period.

No definition available.

Name:	hayn_NumberOfNewAccountingPronouncementsIssued
Namespace Prefix:	hayn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration