v3.26.1
Summary of Significant Accounting Policies - EBP, Investment, Fair Value and NAV (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 206,247,213 $ 164,516,922
Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 190,613,652 148,833,883
Extra Space Storage Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 6,529,194 7,405,810
Brokerage account holdings    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 1,931,310 1,483,376
Fair Value, Inputs, Level 1, Level 2, and Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,173,057 6,793,853
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 190,613,652 148,833,883
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Extra Space Storage Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 6,529,194 7,405,810
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Brokerage account holdings    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 1,931,310 1,483,376
Level 1 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 190,613,652 148,833,883
Level 1 | Extra Space Storage Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 6,529,194 7,405,810
Level 1 | Brokerage account holdings    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 1,931,310 1,483,376
Level 2 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 2 | Extra Space Storage Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 2 | Brokerage account holdings    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Mutual funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Extra Space Storage Inc. common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 0 0
Level 3 | Brokerage account holdings    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 0 $ 0