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Share-based awards (Details) - shares
1 Months Ended 12 Months Ended
Apr. 01, 2015
Sep. 30, 2014
Mar. 31, 2015
Share-based awards      
Number of shares issuable     619,922,272
Number of shares authorized but unissued     22,111,169
Share option and RSUs with four-year vesting schedule      
Share-based awards      
Vesting period     4 years
Vesting percentage per year after initial vesting     25.00%
Share option and RSUs with four-year vesting schedule | Maximum      
Share-based awards      
Expiry period     6 years
Share option and RSUs with four-year vesting schedule and initial vesting at first anniversary | Tranche one      
Share-based awards      
Vesting period     1 year
Vesting percentage     25.00%
Share option and RSUs with four-year vesting schedule and initial vesting at second anniversary | Tranche one      
Share-based awards      
Vesting period     2 years
Vesting percentage     50.00%
Share option and RSUs with six-year vesting schedule      
Share-based awards      
Vesting period     6 years
Vesting percentage per year     16.70%
Share option and RSUs with six-year vesting schedule | Maximum      
Share-based awards      
Expiry period     8 years
2014 Plan      
Share-based awards      
Plan term   10 years  
2014 Plan | Maximum      
Share-based awards      
Additional number of shares subject to award 25,000,000