Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 375,715	$ 346,710	$ 716,996	$ 642,546
Fastening and Hardware
Disaggregation of Revenue [Line Items]
Net sales	247,034	225,298	447,727	401,003
Personal Protective
Disaggregation of Revenue [Line Items]
Net sales	62,099	78,993	146,439	141,786
Keys and Key Accessories
Disaggregation of Revenue [Line Items]
Net sales	50,495	30,869	92,950	75,276
Engraving
Disaggregation of Revenue [Line Items]
Net sales	16,029	11,543	29,815	24,464
Resharp
Disaggregation of Revenue [Line Items]
Net sales	58	7	65	17
Hardware and Protective Solutions
Disaggregation of Revenue [Line Items]
Net sales	263,129	269,499	514,058	482,676
Hardware and Protective Solutions \| Fastening and Hardware
Disaggregation of Revenue [Line Items]
Net sales	201,208	190,572	367,810	340,956
Hardware and Protective Solutions \| Personal Protective
Disaggregation of Revenue [Line Items]
Net sales	61,921	78,927	146,248	141,720
Hardware and Protective Solutions \| Keys and Key Accessories
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Hardware and Protective Solutions \| Engraving
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Hardware and Protective Solutions \| Resharp
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Robotics and Digital Solutions
Disaggregation of Revenue [Line Items]
Net sales	66,351	42,198	122,230	98,505
Robotics and Digital Solutions \| Fastening and Hardware
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Robotics and Digital Solutions \| Personal Protective
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Robotics and Digital Solutions \| Keys and Key Accessories
Disaggregation of Revenue [Line Items]
Net sales	50,289	30,649	92,383	74,027
Robotics and Digital Solutions \| Engraving
Disaggregation of Revenue [Line Items]
Net sales	16,004	11,542	29,782	24,461
Robotics and Digital Solutions \| Resharp
Disaggregation of Revenue [Line Items]
Net sales	58	7	65	17
Canada
Disaggregation of Revenue [Line Items]
Net sales	46,235	35,013	80,708	61,365
Canada \| Fastening and Hardware
Disaggregation of Revenue [Line Items]
Net sales	45,826	34,726	79,917	60,047
Canada \| Personal Protective
Disaggregation of Revenue [Line Items]
Net sales	178	66	191	66
Canada \| Keys and Key Accessories
Disaggregation of Revenue [Line Items]
Net sales	206	220	567	1,249
Canada \| Engraving
Disaggregation of Revenue [Line Items]
Net sales	25	1	33	3
Canada \| Resharp
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
United States
Disaggregation of Revenue [Line Items]
Net sales	323,481	307,539	625,578	573,059
United States \| Hardware and Protective Solutions
Disaggregation of Revenue [Line Items]
Net sales	257,742	265,702	504,539	475,376
United States \| Robotics and Digital Solutions
Disaggregation of Revenue [Line Items]
Net sales	65,739	41,837	121,039	97,683
United States \| Canada
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Canada
Disaggregation of Revenue [Line Items]
Net sales	48,897	36,646	85,178	64,728
Canada \| Hardware and Protective Solutions
Disaggregation of Revenue [Line Items]
Net sales	2,050	1,272	3,279	2,541
Canada \| Robotics and Digital Solutions
Disaggregation of Revenue [Line Items]
Net sales	612	361	1,191	822
Canada \| Canada
Disaggregation of Revenue [Line Items]
Net sales	46,235	35,013	80,708	61,365
Mexico
Disaggregation of Revenue [Line Items]
Net sales	3,337	2,525	6,240	4,759
Mexico \| Hardware and Protective Solutions
Disaggregation of Revenue [Line Items]
Net sales	3,337	2,525	6,240	4,759
Mexico \| Robotics and Digital Solutions
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Mexico \| Canada
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0

HILLMAN COMPANIES INC 10-Q