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Long-term debt - Schedule of long term debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Nov. 30, 2019	Mar. 31, 2017
Debt Instrument [Line Items]
Total	$ 1,655,909		$ 1,340,908
Current portion	383,433		33,537
Non-current portion	1,272,476		1,307,371
Genpact Luxembourg S.r.l. | 2017 Senior Notes
Debt Instrument [Line Items]
Total	$ 349,869		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]
Total	$ 398,298		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]
Total	$ 347,429
Interest rate on senior notes (in percentage)	1.75%	1.75%
Credit facility, net of debt amortization expenses
Debt Instrument [Line Items]
Total	$ 560,313		593,850
2017 Senior Notes
Debt Instrument [Line Items]
Total	349,869		349,342
2019 Senior Notes
Debt Instrument [Line Items]
Total	398,298		397,716
2021 Senior Notes
Debt Instrument [Line Items]
Total	$ 347,429		$ 0

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