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Property plant and equipment (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Cost | $ 286,768 | $ 267,850
Accumulated depreciation | 123,144 | 105,611
Net book value | 163,624 | 162,239
Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 7,124 | 7,165
Accumulated depreciation | 0 | 0
Net book value | 7,124 | 7,165
Buildings [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 70,383 | 68,014
Accumulated depreciation | 21,784 | 19,432
Net book value | 48,599 | 48,582
Machinery and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 178,760 | 168,120
Accumulated depreciation | 84,525 | 73,914
Net book value | 94,235 | 94,206
Enterprise Software [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 14,829 | 10,845
Accumulated depreciation | 6,651 | 4,179
Net book value | 8,178 | 6,666
Office Furniture and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 12,063 | 10,191
Accumulated depreciation | 7,834 | 5,930
Net book value | 4,229 | 4,261
Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 3,609 | 3,515
Accumulated depreciation | 2,350 | 2,156
Net book value | $ 1,259 | $ 1,359

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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