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Long-Term Debt - Schedule of long term debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2019 | Mar. 31, 2017
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | $ 1,663,864 |  | $ 1,340,908 |  |
Current portion of long-term debt | 383,293 |  | 33,537 |  |
Long-term debt, less current portion | 1,280,571 |  | 1,307,371 |  |
Total | 1,663,864 |  | 1,340,908 |  |
Genpact Luxembourg S.r.l. | 2017 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | 349,736 |  | 349,342 |  |
Total | $ 349,736 |  | 349,342 |  |
Interest rate on senior notes (in percentage) | 3.70% |  |  |  | 3.70%
Genpact Luxembourg S.r.l. | 2019 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | $ 398,152 |  | 397,716 |  |
Total | $ 398,152 |  | 397,716 |  |
Interest rate on senior notes (in percentage) | 3.375% |  |  | 3.375% |
Genpact Luxembourg S.r.l. | 2021 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | $ 347,277 |  |  |  |
Total | $ 347,277 |  |  |  |
Interest rate on senior notes (in percentage) | 1.75% | 1.75% |  |  |
Credit facility, Net of Amortization Expenses |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | $ 568,699 |  | 593,850 |  |
Total | 568,699 |  | 593,850 |  |
2017 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | 349,736 |  | 349,342 |  |
Total | 349,736 |  | 349,342 |  |
2019 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | 398,152 |  | 397,716 |  |
Total | 398,152 |  | 397,716 |  |
2021 Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt amount outstanding | 347,277 |  | 0 |  |
Total | $ 347,277 |  | $ 0 |  |

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