RETIREMENT BENEFIT PLANS (Details 6) - Pension Benefit [Member] - USD ($)	Jan. 02, 2021	Dec. 28, 2019
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	$ 78,361,102	$ 74,359,558
Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	5,230,134	6,625,560
Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	73,130,968	67,733,998
EasternCompanyCommonStock [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	5,230,134	6,625,560
EasternCompanyCommonStock [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
EasternCompanyCommonStock [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	5,230,134	6,625,560
Common/Collective Trust Funds [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	347,538	334,138
Common/Collective Trust Funds [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Common/Collective Trust Funds [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Common/Collective Trust Funds [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	347,538	334,138
Russell 10 Year STRIPS Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		4,616,924
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 10 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		4,616,924
Russell 14 Year LDI Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	26,452,904	11,387,626
Russell 14 Year LDI Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Russell 14 Year LDI Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Russell 14 Year LDI Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	26,452,904	11,387,626
Russell 15 Year STRIPS Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		3,050,389
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Russell 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		3,050,389
Russell 8 Year LDI Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		12,796,482
Russell 8 Year LDI Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 8 Year LDI Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 8 Year LDI Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		12,796,482
Multi Asset Core Plus Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	35,139,260	33,413,819
Multi Asset Core Plus Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Multi Asset Core Plus Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0	0
Multi Asset Core Plus Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	35,139,260	33,413,819
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	5,183,933
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 10 to 15 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	5,183,933
Russell 25 Year LDI Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	2,506,615
Russell 25 Year LDI Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 25 Year LDI Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 25 Year LDI Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	2,506,615
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	3,500,718
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	0
Russell 15 to 20 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year	$ 3,500,718
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		2,134,620
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 3 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 1 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		0
Russell 28 to 29 Year STRIPS Fixed Income Fund [Member] | Level 2 [Member]
Fair values of pension plans assets [Abstract]
Fair value of plan assets at beginning of year		$ 2,134,620