Intangbile assets (Details) - USD ($) $ in Thousands	12 Months Ended
	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)