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v3.19.1

Summary of Significant Accounting Policies - Foreign Currency Transactions and Translations (Details) ¥ in Thousands, $ in Thousands | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
Foreign currency transactions and translations |  |  |  |  |  |
Cash, cash equivalents and restricted cash |  | $ 1,387,616 | $ 1,387,616 | ¥ 9,540,556 | ¥ 9,973,891 | ¥ 4,109,577
Convenience translation |  |  |  |  |  |
Convenience translation calculated at the rate of US$1.00 |  | 6.8755 | 6.8755 | 6.8755 |  |
Segment reporting |  |  |  |  |  |
Number of operating segments | segment |  |  | 2 |  |  |
Minimum |  |  |  |  |  |
Value added taxes |  |  |  |  |  |
Rate of VAT levied on PRC subsidiaries of the company (as a percent) | 6.00% | 6.00% |  |  |  |
Maximum |  |  |  |  |  |
Value added taxes |  |  |  |  |  |
Rate of VAT levied on PRC subsidiaries of the company (as a percent) | 17.00% | 16.00% |  |  |  |
Foreign currency risk | RMB denominated |  |  |  |  |  |
Foreign currency transactions and translations |  |  |  |  |  |
Cash, cash equivalents and restricted cash | ¥ |  |  |  | ¥ 6,615,216 | ¥ 4,287,900 |

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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