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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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