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Intangbile assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017
Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ (5,500) | $ (6,700)
Finite-lived Intangible Assets Acquired | 44,100 | 9,000
Indefinite Lived Intangible Assets | 53,472 | 54,682
Finite Lived Intangible Assets: | 965,965 | 1,005,654
Accumulated Amortization: | (423,575) | (383,836)
Total Intangible assets, less accumulated amortization | 595,862 | 676,500
Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Indefinite Lived Intangible Assets | 53,472 | 54,682
Routes [Member] |  |
Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets: | 386,724 | 397,808
Accumulated Amortization: | (145,702) | (136,592)
Permits [Member] |  |
Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets: | 486,359 | 512,659
Accumulated Amortization: | (238,123) | (211,264)
Non-compete agreements [Member] |  |
Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets: | 3,784 | 3,963
Accumulated Amortization: | (2,501) | (2,387)
Trade Names [Member] |  |
Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets: | 72,570 | 76,558
Accumulated Amortization: | (33,242) | (30,235)
Royalty, consulting land use and leasehold [Member] |  |
Intangible Assets [Line Items] |  |
Finite Lived Intangible Assets: | 16,528 | 14,666
Accumulated Amortization: | (4,007) | $ (3,358)
Terra Renewal Services [Member] |  |
Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | $ (44,600) |

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