Leases Schedule of future minimum lease payments (Details) $ in Thousands	Dec. 29, 2017 USD ($)
Property, Plant and Equipment [Line Items]
2018	$ 20,831
2019	18,528
2020	16,851
2021	14,544
2022	12,444
Thereafter	41,920
Total minimum lease payments	125,118
Related Party Real Estate \| Real Estate
Property, Plant and Equipment [Line Items]
2018	1,230
2019	1,250
2020	1,270
2021	1,290
2022	1,224
Thereafter	2,153
Total minimum lease payments	8,417
Third Party \| Real Estate
Property, Plant and Equipment [Line Items]
2018	7,812
2019	6,885
2020	7,271
2021	6,834
2022	6,504
Thereafter	36,822
Total minimum lease payments	72,128
Third Party \| Vehicles
Property, Plant and Equipment [Line Items]
2018	10,312
2019	9,283
2020	7,843
2021	6,169
2022	4,632
Thereafter	2,945
Total minimum lease payments	41,184
Third Party \| Other
Property, Plant and Equipment [Line Items]
2018	1,477
2019	1,110
2020	467
2021	251
2022	84
Thereafter	0
Total minimum lease payments	$ 3,389

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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