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STOCKHOLDERS' EQUITY/MEMBERS' INTEREST - (Tables)
 9 Months Ended
Sep. 28, 2019
Schedule of Capitalization, Equity [Line Items]  
Schedule of changes in ownership of Summit Holdings The following table summarizes the changes in our ownership of Summit Holdings:
 
Summit Inc.
Shares (Class A)
 
LP Units
 
Total
 
Summit Inc.
Ownership
Percentage
Balance — December 29, 2018
111,658,927

 
3,435,518

 
115,094,445

 
97.0
%
Exchanges during period
107,336

 
(107,336
)
 
—

 
 
Other equity transactions
509,735

 
—

 
509,735

 
 
Balance — September 28, 2019
112,275,998

 
3,328,182

 
115,604,180

 
97.1
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance — December 30, 2017
110,350,594

 
3,689,620

 
114,040,214

 
96.8
%
Exchanges during period
254,102

 
(254,102
)
 
—

 
 
Other equity transactions
1,049,856

 
—

 
1,049,856

 
 
Balance — September 29, 2018
111,654,552

 
3,435,518

 
115,090,070

 
97.0
%
Schedule of Changes in Each Component of Accumulated Other Comprehensive Income (Loss) The changes in each component of accumulated other comprehensive income (loss) consisted of the following:
 
Change in
 retirement plans
 
Foreign currency
 translation
 adjustments
 
Cash flow hedge
 adjustments
 
Accumulated
 other
 comprehensive
 income (loss)
Balance — December 29, 2018
$
3,573

 
$
(2,147
)
 
$
1,255

 
$
2,681

Foreign currency translation adjustment, net of tax
—

 
2,364

 
—

 
2,364

Loss on cash flow hedges, net of tax
—

 
—

 
(107
)
 
(107
)
Balance — September 28, 2019
$
3,573

 
$
217

 
$
1,148

 
$
4,938

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance — December 30, 2017
$
2,364

 
$
4,637

 
$
385

 
$
7,386

Foreign currency translation adjustment, net of tax
—

 
(2,295
)
 
—

 
(2,295
)
Income on cash flow hedges, net of tax
—

 
—

 
1,043

 
1,043

Balance — September 29, 2018
$
2,364

 
$
2,342

 
$
1,428

 
$
6,134
Summit Materials, LLC  
Schedule of Capitalization, Equity [Line Items]  
Schedule of Changes in Each Component of Accumulated Other Comprehensive Income (Loss) The changes in each component of accumulated other comprehensive income (loss) consisted of the following:
 
 
 
 
 
 
 
 
 
Accumulated
 
 
 
 
Foreign currency
 
 
 
other
 
 
Change in
 
translation
 
Cash flow hedge
 
comprehensive
 
 
retirement plans
 
adjustments
 
adjustments
 
(loss) income
Balance — December 29, 2018
 
$
(4,392
)
 
$
(19,370
)
 
$
146

 
$
(23,616
)
Foreign currency translation adjustment
 
—

 
3,263

 
—

 
3,263

Loss on cash flow hedges
 
—

 
—

 
(148
)
 
(148
)
Balance — September 28, 2019
 
$
(4,392
)
 
$
(16,107
)
 
$
(2
)
 
$
(20,501
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance - December 30, 2017
 
$
(6,053
)
 
$
(10,022
)
 
$
(1,060
)
 
$
(17,135
)
Foreign currency translation adjustment
 
—

 
(3,179
)
 
—

 
(3,179
)
Income on cash flow hedges
 
—

 
—

 
1,443

 
1,443

Balance - September 29, 2018
 
$
(6,053
)
 
$
(13,201
)
 
$
383

 
$
(18,871
)