Description of Business and Organization (Details)	12 Months Ended
Sep. 30, 2016 item
Nature of operations and basis of presentation
Number of building materials segments	2

Represents the number of building materials segments reported by the entity.

No definition available.

Name:	hw_NumberOfBuildingMaterialsSegments
Namespace Prefix:	hw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration