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Financial Instruments - Summary of Reconciliation Fair Value Measurements in Level 3 of Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Total gains and losses recognized in: |  |  |
Equity instruments at FVOCI - net change in fair value, net of tax | $ 1,825 | $ (1,979) | $ (508)
Other Liabilities Related to Business Combination [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Acquired through business combination (refer note 7) |  | 14,550 |
Level 3 [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Opening balances | 14,921 |  |
Total gains and losses recognized in: |  |  |
Closing balances | 14,875 | 14,921 |
Opening balances | 3,584 |  |
Total gains and losses recognized in: |  |  |
Closing balances | 5,409 | 3,584 |
Level 3 [Member] | Other Liabilities Related to Business Combination [Member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Opening balances | 14,921 |  |
Total gains and losses recognized in: |  |  |
—profit or loss | (350) | 1,421 |
-effect of movements in foreign exchange rates | 304 | (1,050) |
Closing balances | 14,875 | 14,921 |
Level 3 [Member] | Other Investments Equity Securities FVOCI [Member] |  |  |
Total gains and losses recognized in: |  |  |
Opening balances | 3,584 | 5,563 |
Total gains and losses recognized in: |  |  |
Equity instruments at FVOCI - net change in fair value, net of tax | 1,825 | (1,979) |
Closing balances | $ 5,409 | 3,584 | 5,563
Level 3 [Member] | Right to Receive Equity Stake in Travel Entity [Member] |  |  |
Total gains and losses recognized in: |  |  |
Opening balances |  | 411 |
Total gains and losses recognized in: |  |  |
—profit or loss |  | 30 |
Settlement by issuance of shares (refer note 24) |  | $ (441) |
Closing balances |  |  | $ 411

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