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Subsequent Event - Additional Information (Details) | Oct. 02, 2017
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Structil SA | Subsequent event |
Subsequent Event [Line Items] |
Acquisition completion date | Oct. 02, 2017

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- Definition Business acquisition completion date. + References No definition available. + Details
Name: | hxl_BusinessAcquisitionCompletionDate
Namespace Prefix: | hxl_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=hxl_StructilSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |