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v3.19.1

Share-based Payments - Summary of RSUs related to Total Shareholder's Return ('TSR') (Detail) - RSUs related total shareholders return [member] | 12 Months Ended
--- | ---
Mar. 31, 2019 USD ($) yr | Mar. 31, 2018 USD ($) yr
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |
Beginning balance | 248,655 |
Granted | 166,760 | 248,655
Exercised | 0 | 0
Forfeited | (62,040) |
Lapsed | 0 | 0
Ending balance | 353,375 | 248,655
Weighted average fair value, Beginning balance | $ 36.52 |
RSUs exercisable | 0 |
Weighted average fair value, Granted | $ 57.20 | $ 36.52
Weighted average fair value, Exercised | 0 | 0
Weighted average fair value, Forfeited | 44.15 |
Weighted average fair value, Lapsed | 0 | 0
Weighted average fair value, Ending balance | 44.94 | $ 36.52
Weighted average fair value, exercisable | $ 0 |
Weighted average remaining contract term (in years) | yr | 8.49 | 9.08
Weighted average remaining contract term (in years), exercisable | yr | 0 |
Aggregate intrinsic value | $ 18,824,000 | $ 11,272,000
Aggregate intrinsic value, exercisable | $ 0 |

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