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v3.21.2

Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended
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Sep. 25, 2021 USD ($)
Accounting Policies [Abstract] |
Inventory valuation charge, COVID-19 | $ 32,026

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- Definition Inventory Write-Down, COVID-19 + References No definition available. + Details
Name: | hlm_InventoryWriteDownCOVID19
Namespace Prefix: | hlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration