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Additional Capital Disclosures - Summary of Capital Structure (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
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Disclosure of objectives, policies and processes for managing capital [abstract] |  |  |  |  |
Total equity attributable to the equity shareholders of the Company | $ 552,419 | $ 500,483 | $ 494,956 | $ 415,066 | $ 408,189
As percentage of total capital | 90.00% |  | 85.00% |  |
Long term debt | $ 61,800 |  | $ 89,900 |  |
Long term debt | $ 61,800 |  | $ 89,900 |  |
As percentage of total capital | 10.00% |  | 15.00% |  |
Total capital (debt and equity) | $ 614,219 |  | $ 584,856 |  |
Percentage of change in total equity attributable to the equity shareholders of the Company | 19.00% |  |  |  |
Percentage of change in long term debt | (24.00%) |  |  |  |
Percentage of change in total debt | (24.00%) |  |  |  |
Percentage of change in total capital (debt and equity) | 10.00% |  |  |  |

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