Represents the percentage of ownership held by the entity in guarantor subsidiaries.

No definition available.

Name:	hw_OwnershipPercentageGuarantorSubsidiaries
Namespace Prefix:	hw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum percentage of ownership held by the entity below which subsidiaries are considered non-guaranteeing.

+ References

No definition available.

+ Details

Name:	hw_OwnershipPercentageNonGuarantorSubsidiariesMaximum
Namespace Prefix:	hw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=hw_SeniorNotes725PercentDueJanuary2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Condensed Consolidating Financial Information (Details)	9 Months Ended
Condensed Consolidating Financial Information (Details)	Jun. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2013
Long-term debt
Ownership percentage in guarantor subsidiaries	100.00%
Maximum percentage of ownership interest below which subsidiaries are considered non-guaranteeing	100.00%
7.25% Senior notes, due January 2019
Long-term debt
Interest rate on long-term debt (as a percent)	7.25%	7.25%	7.25%	7.25%