v2.4.0.8

Description of business and significant accounting policies (Narrative) (Details) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013
Basis Of Presentation Fiscal Year End And New Accounting Pronouncements Disclosure [Abstract] |  |
Year Founded |  | 1973
Finite-Lived Intangible Assets [Line Items] |  |
Fiscal Period Duration | 371 days | 364 days
Maximum [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 25 years
Maximum [Member] | Patents And Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 15 years
Maximum [Member] | Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 15 years
Minimum [Member] | Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 2 years
Minimum [Member] | Patents And Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 7 years
Minimum [Member] | Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite Lived Intangible Asset Useful Life |  | 3 years
Buildings [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 40 years
Buildings [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 20 years
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 20 years
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 10 years
Enterprise Software [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 5 years
Office Furniture and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 7 years
Office Furniture and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 3 years
Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property Plant And Equipment Useful Life |  | 5 years
Opta Minerals Inc [Member] |  |
Noncontrolling Interest [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 66.00%
Mascoma [Member] |  |
Noncontrolling Interest [Line Items] |  |
Cost Method Investments Percentage |  | 19.00%

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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