v3.8.0.1

Commitments and Contingencies - Contractual Commitments (Details) $ in Millions	Dec. 31, 2017 USD ($)
Ingredients
Long-term Purchase Commitment [Line Items]
Total Committed	$ 64.2
Commitments within 1 year	61.2
Commitments beyond 1 year	3.0
Packaging
Long-term Purchase Commitment [Line Items]
Total Committed	35.4
Commitments within 1 year	35.4
Commitments beyond 1 year	$ 0.0

X

- Definition

Purchase Obligation, Due after Second Year

+ References

No definition available.

+ Details

Name:	twnk_PurchaseObligationDueafterSecondYear
Namespace Prefix:	twnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

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

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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

X

- Definition

Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=twnk_IngredientsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=twnk_PackagingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: