Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 418,705	$ 384,951
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	236,031	179,791
Property and equipment, net	$ 182,674	205,160
Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 11,506	10,982
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 334,643	308,096
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	10 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 61,737	60,412
Computer equipment and software \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Computer equipment and software \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,467	2,749
Furniture and fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	6 years
Furniture and fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	8 years
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,352	$ 2,712

HILLMAN COMPANIES INC 10-K