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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended
	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