SHARE-BASED COMPENSATION - Other Equity Awards Activity (Details) - $ / shares
|
12 Months Ended |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
| Share bonus awards |
|
|
|
| Option Activity |
|
|
|
| Unvested share bonus targeted number of awards, beginning of period (in shares) |
14,619,692
|
17,242,019
|
19,309,172
|
| Granted (in shares) |
8,257,502
|
6,680,739
|
8,261,666
|
| Vested (in shares) |
(5,952,039)
|
(6,945,393)
|
(9,311,984)
|
| Forfeited (in shares) |
(2,021,269)
|
(2,357,673)
|
(1,016,835)
|
| Unvested share bonus targeted number of awards, end of period (in shares) |
14,903,886
|
14,619,692
|
17,242,019
|
| Price Per Share |
|
|
|
| Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share) |
$ 14.39
|
$ 12.24
|
$ 10.71
|
| Average grant date fair value (per share) |
12.59
|
16.97
|
13.46
|
| Vested, weighted average grant-date fair value (in dollars per share) |
13.12
|
11.86
|
9.50
|
| Forfeited, weighted average grant-date fair value (in dollars per share) |
14.51
|
12.20
|
11.15
|
| Unvested share bonus awards, weighted average grant-date fair value, end of period (in dollars per share) |
$ 13.76
|
$ 14.39
|
$ 12.24
|
| Share Bonus Awards with Market Conditions |
|
|
|
| Option Activity |
|
|
|
| Unvested share bonus targeted number of awards, end of period (in shares) |
2,521,930
|
|
|
| Share Bonus Awards with Market Conditions | Fiscal 2017 |
|
|
|
| Option Activity |
|
|
|
| Granted (in shares) |
700,000.0
|
1,700,000.0
|
|
| Unvested share bonus targeted number of awards, end of period (in shares) |
586,077
|
|
|
| Price Per Share |
|
|
|
| Average grant date fair value (per share) |
$ 20.25
|
|
|