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Significant Accounting Policies - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 USD ($) customer | Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 customer | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred financing costs recorded as a non-current asset |  | $ 2,700,000 | $ 3,700,000 |  |
Net deferred financing costs recorded as a non-current contra liability |  | 3,500,000 | 3,700,000 |  |
Short term unamortized deferred financing costs related to facility |  | 3,500,000 | 3,700,000 |  |
Allowance for doubtful accounts |  | 800,000 | 600,000 |  |
Operating lease, right of use assets |  | $ 58,500,000 | $ 66,500,000 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | us-gaap:OtherAssetsNoncurrent | us-gaap:OtherAssetsNoncurrent |  |
Operating lease, liabilities |  | $ 58,500,000 | $ 66,500,000 |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Reserves accounts receivable |  | 200,000 |  |  |
Write-off against accounts receivables |  | 0 |  |  |
Reserve accounts receivable, balance |  | $ 800,000 |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  | true |  |  |
Change in accounting principle, accounting standards update, adoption date |  | Jan. 01, 2020 |  |  |
Percentage of accounts receivable write offs | 50.00% |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  | true |  |  |
Change in accounting principle, accounting standards update, adoption date |  | Jan. 01, 2019 |  |  |
Operating lease, right of use assets |  |  |  |  | $ 50,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  |  | us-gaap:OtherAssetsNoncurrent
Operating lease, liabilities |  |  |  |  | $ 50,000,000
Operating Lease, Liability, Statement Of Financial Position [Extensible List] |  |  |  |  | hxl:AccruedLiabilitiesCurrentAndOtherLiabilitiesNonCurrent
Net sales | Customer concentration |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of major customers | customer |  | 2 | 2 | 2 |
Two customers and their related subcontractors | Net sales | Customer concentration |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration percentage (as a percent) |  | 52.00% | 64.00% | 66.00% |
Minimum | Building and improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 10 years |  |  |
Minimum | Machinery and equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 3 years |  |  |
Minimum | Software |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Finite lived intangible assets, useful life |  | 3 years |  |  |
Maximum | Building and improvements |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 40 years |  |  |
Maximum | Machinery and equipment |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Useful life |  | 25 years |  |  |
Maximum | Software |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Finite lived intangible assets, useful life |  | 10 years |  |  |
Aerospace Composites Malaysia Sdn. Bhd. |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Interest in affiliated company, accounted for using equity method of accounting (as a percent) |  | 50.00% |  |  |
Hexcut Services |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Interest in affiliated company, accounted for using equity method of accounting (as a percent) |  | 25.00% |  |  |

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