Note Receivable From Participant, Vesting Restoration Period EBP, Note Receivable From Participant, Vesting Restoration Period EBP, Note Receivable From Participant, Vesting Restoration Period Participant Contribution, Pretax or Roth, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Pretax or Roth, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Pretax or Roth, Minimum Annual Contribution to Eligible Compensation, Percentage Statistical Measurement [Domain] Statistical Measurement [Domain] Mutual Fund - Vanguard Explorer Fund Admiral Shares Mutual Fund - Vanguard Explorer Fund Admiral Share [Member] Mutual Fund - Vanguard Explorer Fund Admiral Shares EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Interest income from notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Document Information [Line Items] Document Information [Line Items] EBP, Employer, Common Stock Fund EBP, Employer, Common Stock Fund [Member] Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment Acquired, Excluding Plan Interest in Master Trust, Current Value EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Current Value Common Stock Fund Common Stock Fund [Member] Common Stock Fund EBP, Description of Plan and Accounting Change [Abstract] Investment Type [Axis] Investment Type [Axis] Contributions, Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Mutual Fund - Vanguard Strategic Small-Cap Equity Fund Mutual Fund - Vanguard Strategic Small-Cap Equity Fund [Member] Mutual Fund - Vanguard Strategic Small-Cap Equity Fund Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Tax Status EBP, Tax Status [Text Block] Collective Trust - Vanguard Target Retirement 2050 Trust I Collective Trust - Vanguard Target Retirement 2050 Trust I [Member] Collective Trust - Vanguard Target Retirement 2050 Trust I EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Interest and dividend income, investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Notes receivable from participants EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Mutual Fund - Vanguard Total Bond Market Index Fund Instl Shares Mutual Fund - Vanguard Total Bond Market Index Fund Instl Shares [Member] Mutual Fund - Vanguard Total Bond Market Index Fund Instl Shares Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Administrative Services Fees EBP, Administrative Services Fees EBP, Administrative Services Fees EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Payment of benefits EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Contributions, Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP 001 EBP 001 [Member] EBP 001 EBP, Payment to Participant EBP, Payment to Participant [Policy Text Block] Participant Contribution Limit EBP, Participant Contribution Limit EBP, Participant Contribution Limit Net Asset Available for Benefit Net Asset Available for Benefit, Beginning Balance Net Asset Available for Benefit, Ending Balance EBP, Net Asset Available for Benefit EBP, Investment, Fair Value and NAV [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Mutual Fund - Vanguard Federal Money Market Fund Mutual Fund - Vanguard Federal Money Market Fund [Member] Mutual Fund - Vanguard Federal Money Market Fund Mutual Fund - Vanguard Real Estate Index Fund Institutional Shares Mutual Fund - Vanguard Real Estate Index Fund Institutional Shares [Member] Mutual Fund - Vanguard Real Estate Index Fund Institutional Shares Participant Contribution, Pretax or Roth, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax or Roth, Maximum Annual Compensation to Total Compensation, Percentage EBP, Participant Contribution, Pretax or Roth, Maximum Annual Compensation to Total Compensation, Percentage Participant Contribution Increment EBP, Participant Contribution Increment EBP, Participant Contribution Increment EBP, Employer, Common Stock [Member] EBP, Employer, Common Stock [Member] Deductions, Other EBP, Change in Net Asset Available for Benefit, Other Decrease EBP, Change in Net Asset Available for Benefit, Other Decrease Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Tax Status [Abstract] Net increase in assets available for benefits EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Cover [Abstract] EBP, Other Related Party and Party-in-Interest EBP, Other Related Party and Party-in-Interest [Member] Maximum Maximum [Member] Contributions, Company EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] EBP, Schedule of Asset Held for Investment [Abstract] Entity [Domain] Entity [Domain] Collective Trust - Vanguard Target Retirement 2055 Trust I Collective Trust - Vanguard Target Retirement 2055 Trust I [Member] Collective Trust - Vanguard Target Retirement 2055 Trust I Participant Catch-Up Limit EBP, Participant Contribution Catch-Up Limit EBP, Participant Contribution Catch-Up Limit Mutual Fund - Vanguard Wellington Fund Admiral Shares Mutual Fund - Vanguard Wellington Fund Admiral Shares [Member] Mutual Fund - Vanguard Wellington Fund Admiral Shares EBP, Investment, Fair Value and NAV [Abstract] Collective Trust - Vanguard Target Retirement 2035 Trust I Collective Trust - Vanguard Target Retirement 2035 Trust I [Member] Collective Trust - Vanguard Target Retirement 2035 Trust I EBP, Basis of Accounting EBP, Basis of Accounting [Policy Text Block] Mutual Fund - Vanguard Total Intl Stock Index Fund Instl Shares Mutual Fund - Vanguard Total Intl Stock Index Fund Instl Shares [Member] Mutual Fund - Vanguard Total Intl Stock Index Fund Instl Shares EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Investment, Fair Value [Abstract] EBP, Investment, Fair Value [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Mutual Fund Mutual Fund [Member] EBP, Description of Plan [Table] EBP, Description of Plan [Table] EBP, Investment EBP, Investment [Policy Text Block] Collective Trust - Vanguard Target Retirement 2030 Trust I Collective Trust - Vanguard Target Retirement 2030 Trust I [Member] Collective Trust - Vanguard Target Retirement 2030 Trust I Amendment Flag Amendment Flag Mutual Fund - Vanguard Institutional Index Fund Institutional Shares Mutual Fund - Vanguard Institutional Index Fund Institutional Shares [Member] Mutual Fund - Vanguard Institutional Index Fund Institutional Shares Common Collective Trust Common Collective Trust [Member] Participant Catch-Up Contribution, Minimum Age EBP, Participant Catch-Up Contribution, Minimum Age EBP, Participant Catch-Up Contribution, Minimum Age EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Mutual Fund - Vanguard PRIMECAP Fund Admiral Shares Mutual Fund - Vanguard PRIMECAP Fund Admiral Shares [Member] Mutual Fund - Vanguard PRIMECAP Fund Admiral Shares EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Amendments, Maximum Increase to Company’s Liability EBP, Amendment Delegation, Maximum Increase to Company’s Liability EBP, Amendment Delegation, Maximum Increase to Company’s Liability Collective Trust - Vanguard Target Retirement 2070 Trust I Collective Trust - Vanguard Target Retirement 2070 Trust I [Member] Collective Trust - Vanguard Target Retirement 2070 Trust I Mutual Fund - Vanguard Windsor II Fund Admiral Shares Mutual Fund - Vanguard Windsor II Fund Admiral Shares [Member] Mutual Fund - Vanguard Windsor II Fund Admiral Shares EBP, Statement of Net Asset Available for Benefit [Abstract] Investment in Related Party, Fair Market Value Investment in Related Party, Fair Market Value Investment in Related Party, Fair Market Value EBP, Description of Plan EBP, Description of Plan [Text Block] Mutual Fund - Vanguard Extended Market Index Fund Institutional Shares Mutual Fund - Vanguard Extended Market Index Fund Institutional Shares [Member] Mutual Fund - Vanguard Extended Market Index Fund Institutional Shares EBP, Summary of Accounting Policy EBP, Summary of Accounting Policy [Text Block] EBP, Note Receivable from Participant EBP, Note Receivable from Participant [Policy Text Block] EBP, Investment Sold, Excluding Plan Interest in Master Trust, Current Value EBP, Investment Sold, Excluding Plan Interest in Master Trust, Current Value Total additions EBP, Change in Net Asset Available for Benefit, Increase Entity Central Index Key Entity Central Index Key Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Mutual Fund - Vanguard International Growth Fund Admiral Shares Mutual Fund - Vanguard International Growth Fund Admiral Shares [Member] Mutual Fund - Vanguard International Growth Fund Admiral Shares Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Legal Entity [Axis] Legal Entity [Axis] Entity Tax Identification Number Entity Tax Identification Number Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Plan Number EBP, Plan Number Document Type Document Type EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] EBP, Use of Estimate EBP, Use of Estimate [Policy Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Collective Trust - Vanguard Target Retirement 2020 Trust I Collective Trust - Vanguard Target Retirement 2020 Trust I [Member] Collective Trust - Vanguard Target Retirement 2020 Trust I Notes receivable from participants EBP, Note Receivable from Participant Equity Securities [Member] Equity Securities [Member] Collective Trust - Vanguard Target Retirement 2040 Trust I Collective Trust - Vanguard Target Retirement 2040 Trust I [Member] Collective Trust - Vanguard Target Retirement 2040 Trust I Collective Trust - Vanguard Target Retirement 2060 Trust I Collective Trust - Vanguard Target Retirement 2060 Trust I [Member] Collective Trust - Vanguard Target Retirement 2060 Trust I EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] EBP, Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Table Text Block] Minimum Age for Withdrawals from Certain Contribution Accounts Prior to Termination or Retirement Minimum Age for Withdrawals from Certain Contribution Accounts Prior to Termination or Retirement EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] Net appreciation in fair value, investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Employer Contribution Vesting, Requisite Service Period EBP, Employer Contribution Vesting, Requisite Service Period EBP, Employer Contribution Vesting, Requisite Service Period Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Employer Contribution, Annual Vesting Percentage After Requisite Service Period EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Investments [Domain] Investments [Domain] Document Information [Table] Document Information [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Collective Trust - Vanguard Retirement Savings Trust III Collective Trust - Vanguard Retirement Savings Trust III [Member] Collective Trust - Vanguard Retirement Savings Trust III Mutual Fund - Vanguard Total Intl Bond Index Fund Admiral Shares Mutual Fund - Vanguard Total Intl Bond Index Fund Admiral Shares [Member] Mutual Fund - Vanguard Total Intl Bond Index Fund Admiral Shares Mutual Fund - Vanguard Small-Cap Index Fund Institutional Shares Mutual Fund - Vanguard Small-Cap Index Fund Institutional Shares [Member] Mutual Fund - Vanguard Small-Cap Index Fund Institutional Shares Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] Entity Registrant Name Entity Registrant Name Collective Trust - Vanguard Target Retirement 2065 Trust I Collective Trust - Vanguard Target Retirement 2065 Trust I [Member] Collective Trust - Vanguard Target Retirement 2065 Trust I Common Stock Common Stock [Member] EBP, Tax Status [Table] EBP, Tax Status [Table] Investment, Excluding Plan Interest in Master Trust, Cost EBP, Investment, Excluding Plan Interest in Master Trust, Cost Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Collective Trust - Vanguard Target Retirement Income Trust I Collective Trust - Vanguard Target Retirement Income Trust I [Member] Collective Trust - Vanguard Target Retirement Income Trust I Collective Trust - Vanguard Target Retirement 2025 Trust I Collective Trust - Vanguard Target Retirement 2025 Trust I [Member] Collective Trust - Vanguard Target Retirement 2025 Trust I Collective Trust - Vanguard Target Retirement 2045 Trust I Collective Trust - Vanguard Target Retirement 2045 Trust I [Member] Collective Trust - Vanguard Target Retirement 2045 Trust I