Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Director, principal in insurance brokerage company
Transactions with related parties
Commissions paid related party by providers of insurance services	$ 0.1	$ 0.1	$ 0.1
Officer, related to principals of transportation services provider
Transactions with related parties
Cost incurred for transportation facility provided by related party	$ 6.4	$ 5.8	$ 5.4

Represents commissions paid to a related party by third party entities that provide insurance services to the reporting entity.

No definition available.

Name:	hw_CommissionsPaidRelatedPartyByProvidersOfInsuranceServices
Namespace Prefix:	hw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration