v3.8.0.1

Commitments and Contingencies - Contractual Commitments (Details) $ in Millions | Dec. 31, 2017 USD ($)
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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: |