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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