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Recent accounting pronouncements (Details) - ASU 2015-17 - Reclassified - CNY (¥) ¥ in Millions | Mar. 31, 2017 | Mar. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Current deferred tax assets | ¥ 652 | ¥ 451
Non-current deferred tax assets | 652 | 451
Current deferred tax liabilities | 207 | 9
Non-current deferred tax liabilities | ¥ 207 | ¥ 9

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