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v3.19.1

Share-based Payments - Movements in Number of Restricted Share Units Dependent on Market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) - RSUs dependent on market performance condition [member] | 12 Months Ended
--- | ---
Mar. 31, 2019 USD ($) yr | Mar. 31, 2018 USD ($) yr | Mar. 31, 2017 USD ($) yr
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Beginning balance | 203,990 | 203,990 |
Granted | 0 | 0 |
Exercised | 0 | 0 |
Forfeited | 0 | 0 |
Lapsed | 0 | 0 |
Ending balance | 203,990 | 203,990 | 203,990
Weighted average fair value, Beginning balance | $ 13.21 | $ 13.21 |
Exercisable | 5,000 |  |
Weighted average fair value, Granted | $ 0 | 0 |
Weighted average fair value, Ending balance | 13.21 | $ 13.21 | $ 13.21
Exercisable | $ 14.30 |  |
Weighted average remaining contract term (in years) | yr | 6.10 | 7.10 | 8.10
Weighted average remaining contract term (in years), exercisable | yr | 7.08 |  |
Aggregate intrinsic value | $ 10,867,000 | $ 9,247,000 | $ 5,836,000
Aggregate intrinsic value, exercisable | $ 266,000 |  |

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