Intangbile assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 9,000	$ 7,100
Indefinite Lived Intangible Assets	54,682	51,687
Finite Lived Intangible Assets:	1,005,654	961,427
Accumulated Amortization:	(383,836)	(301,187)
Total Intangible assets, less accumulated amortization	676,500	711,927
Trade Names [Member]
Intangible Assets [Line Items]
Indefinite Lived Intangible Assets	54,682	51,687
Routes [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets:	397,808	374,989
Accumulated Amortization:	(136,592)	(105,934)
Permits [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets:	512,659	493,311
Accumulated Amortization:	(211,264)	(170,165)
Non-compete agreements [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets:	3,963	3,638
Accumulated Amortization:	(2,387)	(1,788)
Trade Names [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets:	76,558	76,033
Accumulated Amortization:	(30,235)	(21,042)
Royalty, consulting land use and leasehold [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets:	14,666	13,456
Accumulated Amortization:	$ (3,358)	$ (2,258)