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Subsequent event	12 Months Ended
Subsequent event	Mar. 31, 2017
Subsequent event
Subsequent event	27. Subsequent event In May 2017, the board of directors of the Company authorized the implementation of a new share repurchase program for an aggregate amount of up to US$6.0 billion over a period of two years. The new program replaced, and cancelled the remaining amount under, the existing share repurchase program which was implemented since August 2015.