v3.26.1
FAIR VALUE MEASUREMENTS (Details) - EBP 003 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 1,378,030,090 $ 1,186,888,471
Total | Mutual funds of registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 499,702,966 404,445,218
Total | Common stock - Jack Henry & Associates, Inc.    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 119,600,769 130,048,740
Active Markets for Identical Assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 619,303,735 534,493,958
Active Markets for Identical Assets (Level 1) | Mutual funds of registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 499,702,966 404,445,218
Active Markets for Identical Assets (Level 1) | Common stock - Jack Henry & Associates, Inc.    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 119,600,769 130,048,740
Other Observable Inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Other Observable Inputs (Level 2) | Mutual funds of registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Other Observable Inputs (Level 2) | Common stock - Jack Henry & Associates, Inc.    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant Unobservable Inputs (Level 3)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant Unobservable Inputs (Level 3) | Mutual funds of registered investment companies    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Significant Unobservable Inputs (Level 3) | Common stock - Jack Henry & Associates, Inc.    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
NAV    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 758,726,355 $ 652,394,513