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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

X

- 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.

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X

- 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

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- Details

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