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Stock-based compensation plan (Tables)
 3 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Unvested SARs Activities
The following table summarizes the activities for the outstanding SARs:
Number of SARsWeighted-
Average
Exercise Price in U.S. Cents*		Weighted Average Contractual Remaining Term (years)Aggregate Intrinsic Values (in thousands)
Outstanding as of April 1, 202240,971,875 45
Granted— — 
Exercised(121,875)21
Forfeited(4,950,000)47
Outstanding as of June 30, 202235,900,000 403.43
Vested and expected to vest as of June 30, 202234,907,500 393.40986
Vested as of June 30, 20228,350,000210.751,949