| Results XBRL (NSE) | | Standalone | — | NONINDAS_35794_11791_26052018112335_WEB. |
| Results XBRL (NSE) | 2019-12-31 | Standalone | — | NBFC_INDAS_53259_218218_11022020053345_W |
| Results XBRL (NSE) | 2019-12-31 | Consolidated | — | NBFC_INDAS_53261_218223_11022020053614_W |
| Results XBRL (NSE) | 2020-03-31 | Standalone | — | NBFC_INDAS_55499_262464_30052020011122_W |
| Results XBRL (NSE) | 2020-03-31 | Consolidated | — | NBFC_INDAS_55516_262598_30052020045734_W |
| Results XBRL (NSE) | 2020-06-30 | Standalone | — | NBFC_INDAS_59737_304676_10082020054114_W |
| Results XBRL (NSE) | 2020-06-30 | Consolidated | — | NBFC_INDAS_59741_304692_10082020060251_W |
| Results XBRL (NSE) | 2020-09-30 | Standalone | — | NBFC_INDAS_63422_356009_06112020085704_W |
| Results XBRL (NSE) | 2020-09-30 | Consolidated | — | NBFC_INDAS_63504_356275_07112020020407_W |
| Results XBRL (NSE) | 2020-12-31 | Standalone | — | NBFC_INDAS_67176_402640_05022021032057_W |
| Results XBRL (NSE) | 2020-12-31 | Consolidated | — | NBFC_INDAS_67202_402750_05022021044133_W |
| Results XBRL (NSE) | 2021-06-30 | Standalone | — | NBFC_INDAS_74492_501801_09082021065553_W |
| Results XBRL (NSE) | 2021-06-30 | Consolidated | — | NBFC_INDAS_74497_501823_09082021071930_W |
| Results XBRL (NSE) | 2021-09-30 | Standalone | — | NBFC_INDAS_77927_552383_08112021063010_W |
| Results XBRL (NSE) | 2021-09-30 | Consolidated | — | NBFC_INDAS_77940_552462_08112021084300_W |
| Results XBRL (NSE) | 2021-12-31 | Standalone | — | NBFC_INDAS_81460_604180_07022022062825_W |
| Results XBRL (NSE) | 2021-12-31 | Consolidated | — | NBFC_INDAS_81467_604224_07022022070019_W |
| Results XBRL (NSE) | 2022-03-31 | Standalone | — | NBFC_INDAS_85428_660860_25052022074429_W |
| Results XBRL (NSE) | 2022-03-31 | Consolidated | — | NBFC_INDAS_85448_660955_25052022084632_W |
| Results XBRL (NSE) | 2022-06-30 | Consolidated | — | NBFC_INDAS_638030_2342_08082022162241_WE |
| Results XBRL (NSE) | 2022-09-30 | Standalone | — | NBFC_INDAS_843754_4683_07112022170229_WE |
| Results XBRL (NSE) | 2022-09-30 | Consolidated | — | NBFC_INDAS_843755_4683_07112022170229_WE |
| Results XBRL (NSE) | 2022-12-31 | Standalone | — | NBFC_INDAS_88728_786805_06022023055228.x |
| Results XBRL (NSE) | 2022-12-31 | Consolidated | — | NBFC_INDAS_88745_787033_06022023073843.x |
| Results XBRL (NSE) | 2023-03-31 | Standalone | — | NBFC_INDAS_92917_853781_26052023062515.x |
| Results XBRL (NSE) | 2023-03-31 | Consolidated | — | NBFC_INDAS_92918_853790_26052023062736.x |
| Results XBRL (NSE) | 2023-06-30 | Standalone | — | NBFC_INDAS_96622_915681_11082023060746.x |
| Results XBRL (NSE) | 2023-06-30 | Consolidated | — | NBFC_INDAS_96625_915694_11082023061023.x |
| Results XBRL (NSE) | 2023-09-30 | Standalone | — | NBFC_INDAS_98939_977588_06112023045355.x |
| Results XBRL (NSE) | 2023-09-30 | Consolidated | — | NBFC_INDAS_98943_977603_06112023050133.x |
| Results XBRL (NSE) | 2023-12-31 | Standalone | — | NBFC_INDAS_102323_1044630_05022024041513 |
| Results XBRL (NSE) | 2023-12-31 | Consolidated | — | NBFC_INDAS_102326_1044659_05022024042313 |
| Results XBRL (NSE) | 2024-03-31 | Standalone | — | NBFC_INDAS_107124_1138233_24052024075127 |
| Results XBRL (NSE) | 2024-03-31 | Consolidated | — | NBFC_INDAS_107128_1138250_24052024075427 |
| Results XBRL (NSE) | 2024-06-30 | Standalone | — | NBFC_INDAS_111855_1224019_13082024064456 |
| Results XBRL (NSE) | 2024-06-30 | Consolidated | — | NBFC_INDAS_111860_1224040_13082024064837 |
| Results XBRL (NSE) | 2024-09-30 | Standalone | — | NBFC_INDAS_116968_1317204_19112024060315 |
| Results XBRL (NSE) | 2024-09-30 | Consolidated | — | NBFC_INDAS_116969_1317213_19112024061046 |
| Results XBRL (NSE) | 2024-12-31 | Standalone | — | NBFC_INDAS_118464_1369027_03022025035632 |
| Results XBRL (NSE) | 2024-12-31 | Consolidated | — | NBFC_INDAS_118466_1369040_03022025035941 |
| Results XBRL (NSE) | 2025-03-31 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1452077_260 |
| Results XBRL (NSE) | 2025-03-31 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1452088_260 |
| Results XBRL (NSE) | 2025-06-30 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1501631_040 |
| Results XBRL (NSE) | 2025-06-30 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1501634_040 |
| Results XBRL (NSE) | 2025-09-30 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1563764_031 |
| Results XBRL (NSE) | 2025-09-30 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1563766_031 |
| Results XBRL (NSE) | 2025-12-31 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1616337_020 |
| Results XBRL (NSE) | 2025-12-31 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1616352_020 |
| Results XBRL (NSE) | 2026-03-31 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1672415_250 |
| Results XBRL (NSE) | 2026-03-31 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1672420_250 |
| Results XBRL (NSE) | 2026-06-30 | Standalone | — | INTEGRATED_FILING_NBFC_INDAS_1706884_030 |
| Results XBRL (NSE) | 2026-06-30 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1706885_030 |
| Results XBRL (NSE) | 2026-06-30 | Consolidated | — | INTEGRATED_FILING_NBFC_INDAS_1709862_070 |
| Annual report | 1997-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-1997.PDF |
| Annual report | 1998-03-31 | grade B | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-1998.PDF |
| Annual report | 1999-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-1999.PDF |
| Annual report | 1999-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2000.PDF |
| Annual report | 2001-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2001.PDF |
| Annual report | 2002-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2002.PDF |
| Annual report | 2003-03-31 | grade B | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2003.PDF |
| Annual report | 2004-03-31 | grade B | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2004.PDF |
| Annual report | 2005-03-31 | grade B | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2005.PDF |
| Annual report | 2006-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2006.PDF |
| Annual report | 2007-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2007.PDF |
| Annual report | 2008-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2008.PDF |
| Annual report | 2009-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2009.PDF |
| Annual report | 2010-03-31 | grade A | nan | 5900710310.pdf |
| Annual report | 2011-03-31 | grade A | nan | 5900710311.pdf |
| Annual report | 2012-03-31 | grade A | 2012-06-19T00:00:00 | 5900710312.pdf |
| Annual report | 2013-03-31 | grade A | 2013-06-21T00:00:00 | 5900710313.pdf |
| Annual report | 2014-03-31 | grade A | 2014-06-19T00:00:00 | 5900710314.pdf |
| Annual report | 2015-03-31 | grade A | 2015-06-22T00:00:00 | 5900710315.pdf |
| Annual report | 2016-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2016.PDF |
| Annual report | 2017-03-31 | grade A | nan | SUNDARAM_FINANCE_LTD-590071-MARCH-2017.PDF |
| Annual report | 2019-03-31 | grade A | nan | 5900712019.pdf |
| Annual report | 2020-03-31 | grade A | nan | 5900712020.pdf |
| Annual report | 2021-03-31 | grade A | nan | 5900712021.pdf |
| Annual report | 2022-03-31 | grade A | 2022-07-04T00:00:00 | 73442590071.pdf |
| Shareholding XBRL | 2021-09-30 | — | — | SHP_162004_534077_15102021051217_WEB.xml |
| Shareholding XBRL | 2022-03-31 | — | — | SHP_167109_636579_15042022043120_WEB.xml |
| Shareholding XBRL | 2022-06-30 | — | — | SHP_170261_696369_20072022114110_WEB.xml |
| Shareholding XBRL | 2022-09-30 | — | — | SHP_171305_728561_17102022120403_WEB.xml |
| Shareholding XBRL | 2022-12-31 | — | — | SHP_173832_762060_11012023032130_WEB.xml |
| Shareholding XBRL | 2023-03-31 | — | — | SHP_176237_815207_12042023112513_WEB.xml |
| Shareholding XBRL | 2023-06-30 | — | — | SHP_178998_885717_14072023075858_WEB.xml |
| Shareholding XBRL | 2023-09-30 | — | — | SHP_181196_948499_12102023123929_WEB.xml |
| Shareholding XBRL | 2023-12-31 | — | — | SHP_183602_1013699_10012024010534_WEB.xm |
| Shareholding XBRL | 2024-03-31 | — | — | SHP_186473_1089378_12042024032752_WEB.xm |
| Shareholding XBRL | 2024-06-30 | — | — | SHP_189623_1187417_16072024042907_WEB.xm |
| Shareholding XBRL | 2024-09-30 | — | — | SHP_192106_1270661_15102024051633_WEB.xm |
| Shareholding XBRL | 2024-12-31 | — | — | SHP_194534_1344342_13012025074109_WEB.xm |
| Shareholding XBRL | 2025-03-31 | — | — | SHP_197840_1417822_17042025070852_WEB.xm |
| Shareholding XBRL | 2025-06-30 | — | — | SHP_1484419_16072025050528_WEB.xml |
| Shareholding XBRL | 2025-09-30 | — | — | SHP_1577634_18112025060402_WEB.xml |
| Shareholding XBRL | 2025-12-31 | — | — | SHP_1603945_19012026012935_WEB.xml |
| Shareholding XBRL | 2026-03-31 | — | — | SHP_1679229_03062026045425_WEB.xml |
| Shareholding XBRL | 2026-06-30 | — | — | SHP_1695722_17072026073731_WEB.xml |
| Related-party XBRL | 2023-03-31 | — | — | RPT_853765_26052023061844_WEB.xml |
| Related-party XBRL | 2023-09-30 | — | — | RPT_977615_06112023051029_WEB.xml |
| Related-party XBRL | 2023-09-30 | — | — | RPT_999342_20122023032245_WEB.xml |
| Related-party XBRL | 2024-03-31 | — | — | RPT_1138414_24052024083850_WEB.xml |
| Related-party XBRL | 2024-09-30 | — | — | RPT_1296383_04112024055914_WEB.xml |