Segment Information - Financial Data (Details) - USD ($) $ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 28, 2019 |
Sep. 28, 2019 |
Jun. 29, 2019 |
Mar. 30, 2019 |
Dec. 29, 2018 |
Sep. 29, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 28, 2019 |
Dec. 29, 2018 |
Dec. 30, 2017 |
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
$ 506,259
|
$ 665,847
|
$ 552,591
|
$ 305,950
|
$ 445,090
|
$ 625,017
|
$ 549,235
|
$ 289,916
|
$ 2,222,140
|
$ 2,101,002
|
$ 1,932,575
|
Income (loss) from operations before taxes |
|
|
|
|
|
|
|
|
78,224
|
96,077
|
(158,200)
|
Interest expense |
|
|
|
|
|
|
|
|
116,509
|
116,548
|
108,549
|
Depreciation, depletion and amortization |
|
|
|
|
|
|
|
|
214,886
|
203,305
|
177,643
|
Accretion |
|
|
|
|
|
|
|
|
2,216
|
1,605
|
1,875
|
Loss on debt financings |
|
|
|
|
|
|
|
|
14,565
|
149
|
4,815
|
Tax receivable agreement expense (benefit) |
|
|
|
|
|
|
|
|
16,237
|
(22,684)
|
271,016
|
Gain on sale of business |
|
|
|
|
|
|
|
|
0
|
(12,108)
|
0
|
Transaction costs |
|
|
|
|
|
|
|
|
2,222
|
4,238
|
7,733
|
Non-cash compensation |
|
|
|
|
|
|
|
|
20,403
|
25,378
|
21,140
|
Other |
|
|
|
|
|
|
|
|
(3,800)
|
(6,247)
|
1,206
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
461,462
|
406,261
|
435,777
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
177,495
|
220,685
|
194,146
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
217,102
|
204,910
|
179,518
|
Total assets |
4,067,556
|
|
|
|
3,857,641
|
|
|
|
4,067,556
|
3,857,641
|
3,787,333
|
Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
506,259
|
$ 665,847
|
$ 552,591
|
$ 305,950
|
445,090
|
$ 625,017
|
$ 549,235
|
$ 289,916
|
2,222,140
|
2,101,002
|
1,932,575
|
Income (loss) from operations before taxes |
|
|
|
|
|
|
|
|
94,982
|
74,110
|
113,696
|
Interest expense |
|
|
|
|
|
|
|
|
115,988
|
115,831
|
107,655
|
Depreciation, depletion and amortization |
|
|
|
|
|
|
|
|
214,886
|
203,305
|
177,643
|
Accretion |
|
|
|
|
|
|
|
|
2,216
|
1,605
|
1,875
|
Loss on debt financings |
|
|
|
|
|
|
|
|
14,565
|
149
|
4,815
|
Gain on sale of business |
|
|
|
|
|
|
|
|
0
|
(12,108)
|
0
|
Transaction costs |
|
|
|
|
|
|
|
|
2,222
|
4,238
|
7,733
|
Non-cash compensation |
|
|
|
|
|
|
|
|
20,403
|
25,378
|
21,140
|
Other |
|
|
|
|
|
|
|
|
(3,800)
|
(6,247)
|
1,206
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
461,462
|
406,261
|
435,763
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
177,495
|
220,685
|
194,146
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
217,102
|
204,910
|
179,518
|
Total assets |
3,856,223
|
|
|
|
3,633,244
|
|
|
|
3,856,223
|
3,633,244
|
3,504,241
|
West |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
1,122,338
|
1,117,066
|
998,843
|
West | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
1,122,338
|
1,117,066
|
998,843
|
East |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
809,098
|
703,147
|
629,919
|
East | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
809,098
|
703,147
|
629,919
|
Cement |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
290,704
|
280,789
|
303,813
|
Cement | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Revenue |
|
|
|
|
|
|
|
|
290,704
|
280,789
|
303,813
|
Operating segment |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
174,982
|
213,077
|
187,950
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
213,106
|
202,288
|
176,917
|
Total assets |
3,537,047
|
|
|
|
3,501,727
|
|
|
|
3,537,047
|
3,501,727
|
3,131,724
|
Operating segment | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
174,982
|
213,077
|
187,950
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
213,106
|
202,288
|
176,917
|
Total assets |
3,537,047
|
|
|
|
3,501,727
|
|
|
|
3,537,047
|
3,501,727
|
3,131,724
|
Operating segment | West |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
204,964
|
188,999
|
203,590
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
71,397
|
120,657
|
83,591
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
93,256
|
91,794
|
71,314
|
Total assets |
1,379,684
|
|
|
|
1,370,501
|
|
|
|
1,379,684
|
1,370,501
|
1,225,463
|
Operating segment | West | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
204,964
|
188,999
|
203,590
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
71,397
|
120,657
|
83,591
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
93,256
|
91,794
|
71,314
|
Total assets |
1,379,684
|
|
|
|
1,370,501
|
|
|
|
1,379,684
|
1,370,501
|
1,225,463
|
Operating segment | East |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
187,625
|
138,032
|
139,108
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
77,894
|
64,384
|
68,556
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
81,403
|
75,433
|
67,252
|
Total assets |
1,288,835
|
|
|
|
1,253,640
|
|
|
|
1,288,835
|
1,253,640
|
1,035,609
|
Operating segment | East | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
187,625
|
138,032
|
139,108
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
77,894
|
64,384
|
68,556
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
81,403
|
75,433
|
67,252
|
Total assets |
1,288,835
|
|
|
|
1,253,640
|
|
|
|
1,288,835
|
1,253,640
|
1,035,609
|
Operating segment | Cement |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
103,438
|
111,394
|
127,547
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
25,691
|
28,036
|
35,803
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
38,447
|
35,061
|
38,351
|
Total assets |
868,528
|
|
|
|
877,586
|
|
|
|
868,528
|
877,586
|
870,652
|
Operating segment | Cement | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
103,438
|
111,394
|
127,547
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
25,691
|
28,036
|
35,803
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
38,447
|
35,061
|
38,351
|
Total assets |
868,528
|
|
|
|
877,586
|
|
|
|
868,528
|
877,586
|
870,652
|
Corporate and other |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
(34,565)
|
(32,164)
|
(34,468)
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
2,513
|
7,608
|
6,196
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
3,996
|
2,622
|
2,601
|
Total assets |
530,509
|
|
|
|
355,914
|
|
|
|
530,509
|
355,914
|
655,609
|
Corporate and other | Summit Materials, LLC |
|
|
|
|
|
|
|
|
|
|
|
Segment Reporting Information [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
Total Adjusted EBITDA |
|
|
|
|
|
|
|
|
(34,565)
|
(32,164)
|
(34,482)
|
Total purchases of property, plant and equipment |
|
|
|
|
|
|
|
|
2,513
|
7,608
|
6,196
|
Total depreciation, depletion, amortization and accretion |
|
|
|
|
|
|
|
|
3,996
|
2,622
|
2,601
|
Total assets |
$ 319,176
|
|
|
|
$ 131,517
|
|
|
|
$ 319,176
|
$ 131,517
|
$ 372,517
|