Entity tax identification number Entity Tax Identification Number Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Forfeited nonvested account, decrease from administrative expense EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Threshold [Axis] Threshold [Axis] Threshold Mutual funds Mutual Fund [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Brokerage account holdings EBP, Self-Directed Brokerage Account [Member] Maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Number of shares outstanding (in shares) EBP, Employer, Common Stock, Number of Shares Outstanding EBP, Employer, Common Stock, Number of Shares Outstanding Level 1 Fair Value, Inputs, Level 1 [Member] Catch-up contribution, minimum age EBP, Participant Contribution, After Tax, Catch-Up Contribution Eligibility, Minimum Age EBP, Participant Contribution, After Tax, Catch-Up Contribution Eligibility, Minimum Age Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Involuntary cash-out limit EBP, Involuntary Cash-out, Maximum EBP, Involuntary Cash-out, Maximum Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Investment, number of shares (in shares) EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Extra Space Storage Inc. common stock Common Stock [Member] Investments [Domain] Investments [Domain] Estimates EBP, Use of Estimate [Policy Text Block] Threshold Three Threshold Three [Member] Threshold Three Schedule H, Line 4i, Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Risk and Uncertainties EBP, Risk and Uncertainty [Text Block] Sponsor EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] Interest income from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Investment Type [Axis] Investment Type [Axis] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Threshold [Domain] Threshold [Domain] Threshold [Domain] Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Involuntary cash-out minimum EBP, Involuntary Cash-out, Minimum EBP, Involuntary Cash-out, Minimum Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Common stocks EBP, Employer, Common Stock [Member] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Asset Held for Investment EBP, Asset Held for Investment Threshold Two Threshold Two [Member] Threshold Two Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Participant compensation matched, minimum service period EBP, Requisite Service Period EBP, Requisite Service Period EBP, Tax Status [Table] EBP, Tax Status [Table] Increase in assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Exempt Party-In-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Investments, at fair value: EBP, Investment, Fair Value [Abstract] Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Schedule H, Line 4i, Schedule of Assets (Held at End of Year) EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Minimum participant age EBP, Participant Contribution, After Tax, Minimum Participant Age EBP, Participant Contribution, After Tax, Minimum Participant Age Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Threshold One Threshold One [Member] Threshold One EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] Interest rate EBP, Debt, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Outstanding Loan Balance EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment Options, Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP 001 EBP 001 [Member] EBP 001 Fair Value, Inputs, Level 1, Level 2, and Level 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Document Type Document Type Primary residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term Entity Central Index Key Entity Central Index Key Interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common collective trusts Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Risk and Uncertainty [Abstract] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Subsequent Events EBP, Subsequent Event [Policy Text Block] Income Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Document Information [Table] Document Information [Table] Note Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income, net EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Forfeited nonvested account, excess contributions EBP, Forfeited Nonvested Account, Excess Contributions EBP, Forfeited Nonvested Account, Excess Contributions EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Total assets available for benefits Beginning of the year End of the year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Matching percentage EBP, Employer Contribution, Matching Percentage EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]