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PRINCIPAL ACCOUNTING POLICIES - Foreign currencies and land use rights (Details) - ¥ / $ | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 29, 2017
RMB/USD exchange rate used in translation |  | 0.1537
Minimum |  |
Useful life | 3 years |
Maximum |  |
Useful life | 10 years |
Land use rights | Minimum |  |
Useful life | 40 years |
Land use rights | Maximum |  |
Useful life | 50 years |

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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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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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