The amount of accrued medical and workers compensation claims.

No definition available.

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- Definition

The aggregate annual amount at which stop-loss coverage begins on workers compensation claims.

+ References

No definition available.

+ Details

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- Definition

The total expense for all benefit plans combined including all general and discretionary bonuses but excluding standard health and life insurance programs and ESPP expense.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- 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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- Definition

Employee Stock Purchase Plan amount of shares available for future issuance.

+ References

No definition available.

+ Details

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Namespace Prefix:	hw_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Vesting period for 401(k) matching contributions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of operative employee benefit plans maintained by the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

Percentage of cash compensation that employees can have deducted from their pay for purchase of stock through the Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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

- Definition

Percentage of employee base compensation up to which they are allowed to make tax-deferred contributions into the DCP.

+ References

No definition available.

+ Details

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

- Definition

Percentage of employee incentive compensation up to which they are allowed to make tax-deferred contributions into the DCP.

+ References

No definition available.

+ Details

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

- Definition

Represents the participant age at which full vesting of employer contribution to the profit sharing program is complete.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

Represents the participant age at which the vesting of employer contribution to the profit sharing program begins.

+ References

No definition available.

+ Details

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Namespace Prefix:	hw_
Data Type:	xbrli:integerItemType
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Period Type:	duration

- Definition

Represents the percentage of employer's contributions to participants in the profit sharing program that vests in a given year.

+ References

No definition available.

+ Details

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

- Definition

The amount per individual per year in excess of which stop-loss coverage begins on self-insured medical insurance plans.

+ References

No definition available.

+ Details

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

- Definition

The amount per occurrence over which stop-loss coverage begins on workers compensation claims.

+ References

No definition available.

+ Details

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

- Definition

Aggregate number of common shares reserved for future issuance.

+ 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 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_PlanNameAxis=hw_EmployeeSharePurchasePlanMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Commitments and Contingencies - Benefit Plans (Details) $ in Thousands, shares in Millions	12 Months Ended
	Sep. 30, 2016 USD ($) item shares	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Commitments and Contingencies
Number of employee benefit plans \| item	6
Benefit plan expenses, net	$ 23,800	$ 34,800	$ 26,700
Percentage of compensation as tax-deferred contributions	50.00%
Vesting period for matching contributions	3 years
Percentage of tax-deferred contributions of base compensation	50.00%
Percentage of tax deferred contributions of incentive compensation	100.00%
Annual vesting percentage under profit sharing program	20.00%
Participant age at which vesting of employer contribution begins \| item	61
Participant age at which full vesting of employer contribution is complete \| item	65
Employee Share Purchase Plan
Commitments and Contingencies
Shares held in reserve for issuance \| shares	4.3
ESPP shares available for future issuance \| shares	2.3
Percentage of cost per share of the fair market value at the end of each quarterly offering period	85.00%
Minimum \| Employee Share Purchase Plan
Commitments and Contingencies
Percentage of cash compensation	1.00%
Maximum \| Employee Share Purchase Plan
Commitments and Contingencies
Percentage of cash compensation	10.00%
Self Insurance
Commitments and Contingencies
Stop-loss coverage per individual per year	$ 200
Stop-loss coverage per occurrence	350
Annual aggregate stop-loss coverage	5,000
Accrued medical and workers compensation claims	$ 5,900