Name:	hds_DebtInstrumentCollateralPledgedPercentageOfSpecifiedSubsidiaries
Namespace Prefix:	hds_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of commitments component which the reporting entity's specified excess availability (as defined in the debt instrument) must exceed to avoid required compliance ratio requirements.

No definition available.

Name:	hds_DebtInstrumentCovenantComplianceSpecifiedExcessAvailabilityPercentageOfCommitmentsComponent
Namespace Prefix:	hds_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the fixed amount which the reporting entity's specified excess availability (as defined in the debt instrument) must exceed to avoid required compliance ratio requirements.

No definition available.

Name:	hds_DebtInstrumentCovenantComplianceSpecifiedExcessAvailabilityThresholdComponent
Namespace Prefix:	hds_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the fixed charge ratio (as defined in the debt instrument) which the reporting entity is required to maintain in the event of a Liquidity Event (as defined).

No definition available.

Name:	hds_FixedChargeCoverageRatio
Namespace Prefix:	hds_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Represents the minimum number of incremental term loan facilities permitted to be included in an asset based lending facility.

No definition available.

Name:	hds_LineOfCreditFacilityIncrementalTermLoanFacilitiesPermittedInclusionInAssetBasedLendingFacilityMinimum
Namespace Prefix:	hds_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the aggregate borrowing capacity under the line of credit facility, including permitted incremental term loans, revolving or letter of credit facilities that may be added to the facility.

No definition available.

Name:	hds_LineOfCreditFacilityMaximumBorrowingCapacityIncludingIncrementalCommitments
Namespace Prefix:	hds_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the minimum number of revolving credit facility commitments permitted to be included in an asset based lending facility.

No definition available.

Name:	hds_LineOfCreditFacilityRevolvingCreditFacilityCommitmentsPermittedInclusionInAssetBasedLendingFacilityMinimum
Namespace Prefix:	hds_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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

- References

No definition available.

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

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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

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

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiaryIssuerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=hds_AssetBasedLendingFacilityDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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