Retirement Benefit Plans (Details 6) - Pension Benefit [Member] - USD ($)	Dec. 30, 2023	Dec. 31, 2022
Fair value of plan assets at beginning of year	$ 60,836,643	$ 58,527,250
Level 2 [Member]
Fair value of plan assets at beginning of year	56,062,246	54,343,143
Level 1 [Member]
Fair value of plan assets at beginning of year	4,774,396	4,184,107
Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
Eastern Company Common Stock [Member]
Fair value of plan assets at beginning of year	4,774,396	4,184,107
Eastern Company Common Stock [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	4,774,396	4,184,107
Eastern Company Common Stock [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
RITC Small Cap Fund (b) [Member]
Fair value of plan assets at beginning of year	567,998
RITC Small Cap Fund (b) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	567,998
RITC International Fund (c) [Member]
Fair value of plan assets at beginning of year	3,669,895
RITC International Fund (c) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	3,669,895
RITC Emerging Markets Fund (d) [Member]
Fair value of plan assets at beginning of year	1,298,014
RITC Emerging Markets Fund (d) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	1,298,014
RITC World Equity Fund (e) [Member]
Fair value of plan assets at beginning of year	7,960,264
RITC World Equity Fund (e) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	7,960,264
RITC Russell Investments Russell 1000? Index Fund (a) [Member]
Fair value of plan assets at beginning of year	6,595,564
RITC Russell Investments Russell 1000? Index Fund (a) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	6,595,564
RITC Global Real Estate Securities Fund (f) [Member]
Fair value of plan assets at beginning of year	1,373,408
RITC Global Real Estate Securities Fund (f) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	1,373,408
RITC Global Listed Infrastructure Fund (g) [Member]
Fair value of plan assets at beginning of year	1,327,625
RITC Global Listed Infrastructure Fund (g) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	1,327,625
Common/Collective Trust Funds [Member]
Fair value of plan assets at beginning of year	411,688	391,357
Common/Collective Trust Funds [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	411,688	391,357
Common/Collective Trust Funds [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	0	0
Common/Collective Trust Funds [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
RITC Commodities Fund (h) [Member]
Fair value of plan assets at beginning of year	1,161,864
RITC Commodities Fund (h) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	1,161,864
RIIFL High Yield Bond Fund (i) [Member]
Fair value of plan assets at beginning of year	2,643,118
RIIFL High Yield Bond Fund (i) [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	2,643,118
Multi Asset Core Plus Fund [Member]
Fair value of plan assets at beginning of year		26,244,623
Multi Asset Core Plus Fund [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year		26,244,623
Multi Asset Core Plus Fund [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year		0
Multi Asset Core Plus Fund [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year		0
Russell 25 Year LDI Fixed Income Fund [Member]
Fair value of plan assets at beginning of year	9,858,521	4,376,600
Russell 25 Year LDI Fixed Income Fund [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	9,858,521	4,376,600
Russell 25 Year LDI Fixed Income Fund [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 25 Year LDI Fixed Income Fund [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 14 Year LDI Fixed Income Fund [Member]
Fair value of plan assets at beginning of year	17,481,926	18,012,813
Russell 14 Year LDI Fixed Income Fund [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	17,481,926	18,012,813
Russell 14 Year LDI Fixed Income Fund [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 14 Year LDI Fixed Income Fund [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member]
Fair value of plan assets at beginning of year	876,584	2,151,410
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	876,584	2,151,410
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member]
Fair value of plan assets at beginning of year	835,778	3,166,340
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair value of plan assets at beginning of year	835,778	3,166,340
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair value of plan assets at beginning of year	0	0
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair value of plan assets at beginning of year	$ 0	$ 0