Long-term Debt - ABL Revolver (Details) $ in Millions	3 Months Ended
Dec. 31, 2016 USD ($)
ABL Revolver
Long-term debt
Revolving credit arrangement amount outstanding	$ 0.0
Maximum borrowing capacity	70.0
Current borrowing capacity	$ 57.4
Termination date based on the earliest maturity date of the specified long-term debt	3 months
Line of credit facility, interest rate at period end (as a percent)	2.50%
ABL Revolver \| Minimum
Long-term debt
Line of credit facility unused capacity commitment fee percentage	0.25%
Specified percentage of availability below which a monthly fixed charge coverage ratio applies	12.50%
Coverage ratio	1.0
ABL Revolver \| Maximum
Long-term debt
Line of credit facility unused capacity commitment fee percentage	0.375%
ABL Revolver \| London Interbank Offered Rate (LIBOR)
Long-term debt
Variable interest rate base	LIBOR
Percentage points added to the reference rate, one	1.50%
Percentage points added to the reference rate, two	1.75%
Percentage points added to the reference rate, three	2.00%
ABL Revolver \| Base Rate
Long-term debt
Variable interest rate base	Base rate
Percentage points added to the reference rate, one	0.25%
Percentage points added to the reference rate, two	0.50%
Percentage points added to the reference rate, three	0.75%
ABL Revolver \| Prime Rate
Long-term debt
Variable interest rate base	Prime rate
ABL Revolver \| Federal funds rate
Long-term debt
Variable interest rate base	Federal funds rate
Interest rate margin (as a percent)	0.50%
ABL Revolver \| Thirty Day LIBO
Long-term debt
Variable interest rate base	30-day LIBO
Interest rate margin (as a percent)	1.00%
Letter of Credit
Long-term debt
Maximum borrowing capacity	$ 35.0
Outstanding standby letters of credit	10.6
Swingline Facility
Long-term debt
Maximum borrowing capacity	$ 10.5

Represents the required monthly fixed charge coverage ratio for the preceding twelve-month period.

No definition available.

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- Definition

The first percentage points, depending on the entity's average net excess availability under asset-based revolving line of credit facility, added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The third percentage points, depending on the entity's average net excess availability under asset-based revolving line of credit facility, added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The second percentage points, depending on the entity's average net excess availability under asset-based revolving line of credit facility, added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Represents the specified percentage of availability under the credit facility below which the entity is required to maintain a monthly fixed charge coverage ratio for the preceding twelve-month period.

+ References

No definition available.

+ Details

Name:	hw_LineOfCreditFacilitySpecifiedPercentageOfAvailabilityForFixedChargeCoverageRatioToApply
Namespace Prefix:	hw_
Data Type:	num:percentItemType
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Period Type:	duration

- Definition

The earliest termination date of the credit facility based on the earliest maturity date of the specified long-term debt.

+ References

No definition available.

+ Details

Name:	hw_LineOfCreditFacilityTerminationDateBasedOnEarliestMaturityOfLongTermDebt
Namespace Prefix:	hw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- 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

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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